Explanations / 6.1 Qualities of Explanations Questions: 0 of 3 complete (0%) | 0 of 2 correct (0%) Qualities of Explanations An explanation is a statement that provides a reason for why or how something became the way it is. Arguments present a conclusion that's presumably new to you and then support this conclusion with evidence that you're likely to believe. Explanations work the other way around: they start with a conclusion that you likely believe (e.g., the sky is blue) and then offer an explanation for why that is so (e.g., because God is a UNC fan). We will be looking specifically at causal explanations—that is, explanations in which you suggest that a particular physical or behavioral phenomenon is the result of another event. Situation Explanation Traffic on a Saturday There must be a football game today. Most explanations start as theories. It can be challenging to fight the human impulse to pick the first theory that comes to mind and stop there, but what are the odds that the first thing you conceive of is in fact the best possible explanation? Situation Explanation Traffic on a Saturday Perhaps there's a concert today? Maybe an art festival? Or possibly an accident up ahead? With a little imagination, you can come up with a seemingly unlimited number of theories, but at some point you've likely exhausted all the plausible explanations. Situation Explanation Traffic on a Saturday Perhaps a new IKEA has been built without my hearing anything about it, and all these people are headed to the grand opening. As with all critical thinking, you'll need some judgment here. Discard the implausible theories (at least initially) and give fair consideration to all the reasonable ones: · State your theory clearly (make a hypothesis). · Consider possible alternatives. · Look at the evidence. · Evaluate the theory. Sometimes the facts make the explanation quite clear: I can see a train moving through an intersection several hundred yards ahead. That explains why traffic isn't moving. Other times, you'll need to employ inductive reasoning to establish the most likely cause: I can't see the tracks from here, but I drive through here every Saturday morning and usually a train was responsible for traffic being stalled. So it's probably a train. We are presented with many such explanations on a daily basis. Why is this webpage not loading?Why are sales down for last quarter?Why is my spouse not speaking to me? As you consider potential explanations, keep the following standards in mind. Consistency First, is it internally consistent or does it contradict itself? Second, is it externally consistent? Could this explanation effectively and fully account for whatever it's supposed to explain? A good theory should be compatible with what we already know about how the world works. This is a problem with many paranormal theories—they go against accepted scientific fact. If the theory contradicts established knowledge, the burden of proof is on the new t ...

1. Explanations / 6.1 Qualities of Explanations Questions: 0 of 3
complete (0%) | 0 of 2 correct (0%)
Qualities of Explanations
An explanation is a statement that provides a reason for why or
how something became the way it is. Arguments present a
conclusion that's presumably new to you and then support this
conclusion with evidence that you're likely to believe.
Explanations work the other way around: they start with a
conclusion that you likely believe (e.g., the sky is blue) and
then offer an explanation for why that is so (e.g., because God
is a UNC fan).
We will be looking specifically at causal explanations—that is,
explanations in which you suggest that a particular physical or
behavioral phenomenon is the result of another event.
Situation
Explanation
Traffic on a Saturday
There must be a football game today.
Most explanations start as theories. It can be challenging to
fight the human impulse to pick the first theory that comes to
mind and stop there, but what are the odds that the first thing
you conceive of is in fact the best possible explanation?
Situation
Explanation
Traffic on a Saturday
Perhaps there's a concert today?
Maybe an art festival?
Or possibly an accident up ahead?
With a little imagination, you can come up with a seemingly
unlimited number of theories, but at some point you've likely
exhausted all the plausible explanations.
Situation
Explanation
Traffic on a Saturday

2. Perhaps a new IKEA has been built without my hearing
anything about it, and all these people are headed to the grand
opening.
As with all critical thinking, you'll need some judgment here.
Discard the implausible theories (at least initially) and give fair
consideration to all the reasonable ones:
· State your theory clearly (make a hypothesis).
· Consider possible alternatives.
· Look at the evidence.
· Evaluate the theory.
Sometimes the facts make the explanation quite clear:
I can see a train moving through an intersection several hundred
yards ahead. That explains why traffic isn't moving.
Other times, you'll need to employ inductive reasoning to
establish the most likely cause:
I can't see the tracks from here, but I drive through here every
Saturday morning and usually a train was responsible for traffic
being stalled. So it's probably a train.
We are presented with many such explanations on a daily basis.
Why is this webpage not loading?Why are sales down for last
quarter?Why is my spouse not speaking to me?
As you consider potential explanations, keep the following
standards in mind.
Consistency
First, is it internally consistent or does it contradict itself?
Second, is it externally consistent? Could this explanation
effectively and fully account for whatever it's supposed to
explain?
A good theory should be compatible with what we already know
about how the world works. This is a problem with many
paranormal theories—they go against accepted scientific fact. If
the theory contradicts established knowledge, the burden of
proof is on the new theory.
Falsifiability
Life is fabulously convenient when there's a quick and easy way
to test a hypothesis. Simply asking an expert, examining the

3. evidence, or swapping out the battery may be enough to validate
or invalidate your hypothesis.
If you can't test a theory, you've got a non-falsifiable hypothesis
because there's no theoretical way to prove it false.
The lucky rabbit's foot brings good luck every time the energy
in the air is good.
The reason the weather has been getting hotter is because
Hephaestus, the ancient Greek god of fire, is angry that people
don't believe in him anymore.
A fortune teller predicts that a stranger will have a profound
influence on your future in ways you don't even realize.
Scope
Great explanations have broad predictive power—they explain a
lot. The more the theory predicts and explains, the better. This
was how the heliocentric theory ultimately won out over the
geocentric theory; the proposition that the earth moves around
the sun explained so much more in astronomy than the
proposition that the sun moves around the earth.
Simplicity
As a general rule, the best explanation is the simplest one that
makes the fewest assumptions. Check out any conspiracy
theory. These theories tend to involve unnecessarily complex
explanations that raise more questions than they answer, as
opposed to mainstream explanations, which are typically
simpler and based on plausible premises.
Causality
Just because two things often happen together (correlation), this
doesn't necessarily mean that one causes the other.
Peter's baby teeth began to fall out around the same time he got
better at riding a bike without training wheels. Therefore,
Peter's bike-riding skills were improved by his teeth loss.
There's no reasonable link between teeth falling out (the
purported cause) and bike-riding ability (the purported effect)
for this to be a good explanation.
Answer the following questions about the material above.

4. Top of Form
Imagine that you go into your home and see muddy footprints
on the floor from shoes you know are not your own. Give
examples of two plausible explanations and two unlikely
explanations for the footprints.
No response saved yet. Save Draft Post ?
Bottom of Form
Which of the following explanations for a sudden increase in
car accidents at a particular intersection is an unfalsifiable
hypothesis?
· Drivers going through the intersection are experiencing a
secret impulse to drive recklessly.
· Road conditions have worsened due to an unusually cold and
wet winter.
· The new mall built nearby has drawn more young,
inexperienced drivers to the area.
· A popular new nightclub has opened two blocks away, leading
to more impaired drivers in the neighborhood.
Save
Tyler and Grace water their amaryllis plant regularly, yet for
some reason the plant withers and dies. Tyler suggests, "Maybe
there was some peculiar property of this particular amaryllis
that caused water molecules to react with the soil molecules and
chemically change into arsenic molecules, and the arsenic
poisoned the plant." Which of the following is one of the
drawbacks of Tyler's proposed explanation?
· It contradicts itself by claiming that water both helped the
plant and hurt the plant at the same time.
· It is consistent with what science knows about chemical
reactions involving water molecules.
· It is too simple and doesn't make enough assumptions about
how water molecules behave.
· It confuses correlation and causation by assuming that
watering the plant had something to do with its death.
Explanations / 6.2 Practice: Qualities of Explanations

5. Questions: 0 of 7 complete (0%) | 0 of 2 correct (0%)
Practice: Qualities of Explanations
Explaining an Epidemic
Sometimes we seek valid explanations for events merely to
satisfy our own personal curiosity, such as wondering why a
new mural on the side of a building downtown suddenly
appeared. Other times, finding an explanation can be literally a
matter of life and death. The following two videos recount the
tragedies of the London cholera outbreak of 1854 and physician
John Snow's heroic quest to find, quite simply, an explanation.
Watch the two videos below, and then answer the following
questions.
YouTube video. https://youtu.be/HKA0htesJOA. Uploaded May
2, 2012, by the U.S. Census Bureau. To activate captions, first
click the play button and then click the CC button in the
embedded player. For a text transcript, follow the link below.
Read Text Version
TED video.
http://www.ted.com/talks/steven_johnson_tours_the_ghost_map.
Filmed November 2006 at TEDSalon 2006. To activate
subtitles, first click the play button and then open the dropdown
menu in the embedded player and choose a language. For a text
transcript, follow the link below.
Read Text Version
In the situation presented in the first video, what was in need of
an explanation?
· why England had more epidemics than other countries
· what caused the bad smells in London
· why cholera was so much more dangerous than other diseases
· what caused the cholera outbreak
Save
According to the "Answering the Three Questions" video, in
what way was the "miasmas" (bad smells) explanation
inconsistent?
No response saved yet. Save Draft Submit ?

6. What explanation did Dr. Snow settle on?
· Cholera spread from animals to people.
· Cholera spread through the water supply.
· Cholera spread through contaminated food.
· Cholera spread through contaminated air.
Save
How was Dr. Snow able to test his proposed explanation?
No response saved yet. Save Draft Submit ?
Explain how Dr. Snow was able to demonstrate that he wasn't
confusing correlation with causation.
No response saved yet. Save Draft Submit ?
Good explanations are often simple, yet they can explain a lot.
Explain how the story of Dr. Snow’s “ghost map” drawing
demonstrates this.
No response saved yet. Save Draft Submit ?
Your Turn
·
Top of Form
Steven Johnson argues that the story of the cholera epidemic
and Dr. Snow's map is "fundamentally optimistic." Explain
whether or not you agree and why.
Explanations / 6.3 Scientific Explanations Questions: 0 of 3
complete (0%) | 0 of 2 correct (0%) Scientific Explanations
Science is all about explanations, about understanding how the
world works and finding ever better ways to explain and manage
it. As such, scientists tend to excel at critical thinking, and they
typically have higher standards for explanations than those in
other walks of life.Science Basics
· Science is a means for uncovering truth that investigates
causal explanations to discover empirical facts about how the
world works.

7. · Science is not the only way of constructing knowledge, since
we also learn about the world from direct perception, by
reasoning, and through aspects of life that are not empirically
measurable such as humor, dignity, and love.
· The reliability of science comes from its use of precise
definitions, clearly defined contexts, and replicable results. If
no one else can recreate your experiment, it's more anecdote
than science.
It is worth noting that while scientific investigations produce
verifiable insights, they also routinely invalidate the results of
earlier scientific investigations. For this reason, scientists must
remain vigilant for errors in method, measure, or inference and
be open to alternate explanations.The Scientific Method
Science is defined by a particular mode of investigation that
scientists follow to investigate causal claims. This is known as
the scientific method, and it involves a series of steps:
1. Identify the problem or question.
2. Gather evidence and make observations.
3. Form a hypothesis to explain what is happening.
4. Perform an experiment to test the hypothesis.
5. Analyze the results to see if they confirm or refute the
hypothesis.
This structure is consistent with much of critical thinking. What
sets scientific claims apart are their empirical, observable data
and the replicability of experiments.
Bear in mind that research methodology is a rich and complex
discipline because there are so many ways for an experiment to
go wrong or provide misleading evidence. The basics of the
scientific method are quite simple, but executing valid
experiments and reasoning soundly from good data isn't nearly
as straightforward as it may seem.Limits of Science
Science provides such compelling evidence for claims that it's
worth mentioning a few of the limitations of science.Bias
Scientific efforts may be undertaken by people with personal,
political, or financial motives pushing them into many of the
pitfalls we've previously described, such as selection bias in

8. choosing what to test, how to structure the test, and which
evidence to share. Another common failing is to conclude the
overall experiment with an explanation that conveniently
supports the scientist's goals but isn't the best explanation
possible.Metaphysics
Science can't explain things that can't be observed and
measured. So questions of ethics, aesthetics, and metaphysics
are usually outside the scope of the scientific method. For
example, the scientific method is, ironically, insufficient for
making an argument that science is valuable.Science vs.
Pseudoscience
Some claims look like science but aren't. We call these
pseudoscience. Pseudoscience doesn't follow the rules of the
scientific method. To protect yourself from being taken in by
pseudoscience, look out for the following signs:
· Providing the explanation after the fact
· Failing to consider alternatives
· Not being open to the possibility of error
· Bypassing peer review before reporting widely
· Relying heavily on anecdotal evidence
A pseudoscientific explanation will often fail many of the
standards of a good explanation:
· Not empirically testable
· Doesn't explain anything beyond the phenomenon it's
supposed to explain
· Overly complex / raises more questions
· Doesn't fit in with what we already know about how the world
works
Answer the following questions about the material above.
Which of the following questions would you MOST likely look
to science to answer?
· Did Percy Shelley's poetry have more influence on English
Romanticism than Lord Byron's?
· Will passing legislation limiting air pollution antagonize
voters who oppose government regulation?
· Will life be more fulfilling if you devote it to the pursuit of

9. meaningful interpersonal relationships or to the work of making
the world a better place?
· Are there any circumstances in which humans can
telepathically communicate with one another?
Save
Which of the following is an accurate statement about the
nature of science?
· Science avoids considering alternate explanations or being
open to the possibility of error.
· Science is self-correcting and perpetually seeking out the best
and most accurate explanations.
· Science relies heavily on anecdotal evidence.
· Science is the only way we construct knowledge.
Save
A friend claims that eating chocolate can strengthen your bone
marrow. You're skeptical of the credibility of that statement, so
you read two scientific studies. The first, funded by a large
chocolate manufacturing company, confirms this assertion,
while the second, funded by the American Society for Nutrition,
reaches the opposite conclusion. Should you be more inclined to
trust one of these reports over the other? Explain your answer.
Explanations / 6.4 Practice: Scientific Explanations Questions:
0 of 7 complete (0%) | 0 of 3 correct (0%)
Practice: Scientific Explanations
Full Moon, Weird Things
With all the strange and miraculous things going on in the
world, sometimes the most astonishing and seemingly
impossible claims turn out to be completely true. Other times
they're not. How can you tell the difference? In the first video
below, Michael Shermer, editor in chief of Skeptic magazine,
provides a list of ten questions you should ask yourself
whenever you're presented with a claim that may be scientific or
pseudoscientific. The second video, also featuring Michael
Shermer, explores the veracity of the popular notion that
strange things happen when the moon is full.

10. Watch the video below, and then answer the following
questions.
YouTube video. https://youtu.be/hJmRbSX8Rqo. Uploaded
September 5, 2012, by Rob Robbie. To activate captions, first
click the play button and then click the CC button in the
embedded player. For a text transcript, follow the link below.
Read Text Version
According to Shermer, why do people believe in "weird things"?
· People fail to realize that they should only believe what they
can see with their own eyes.
· Our nation's educational system fails to adequately teach the
difference between science and pseudoscience.
· Our brains are wired to find meaningful patterns.
· Only scientists are capable of sorting out truth from falsehood.
Save
One of the examples of bad science in the video is the story of
the Fleischmann-Pons cold fusion experiment. What was the
problem with the cold fusion claim?
· There was no practical use for cold fusion.
· The media misrepresented their claims.
· No one else could replicate the experiment.
· Fleischmann and Pons lacked scientific backgrounds.
Save
According to Shermer, what is the difference between the
people at SETI and people who believe in UFOs?
· People who believe in UFOs have a preponderance of
evidence.
· The SETI people are playing by the rules of science.
· The SETI people use a lot of high-tech equipment.
· People who believe in UFOs are idiots.
Save
Watch the video below, and then answer the following
questions.
YouTube video. https://youtu.be/KoyDmwNwIKQ. Uploaded
October 19, 2009, by TARPSociety. To activate captions, first
click the play button and then click the CC button in the

11. embedded player. For a text transcript, follow the link below.
Read Text Version
One of the nurses says, "I'm a nurse, and I know this for a fact."
Explain how this comment could be used to illustrate the fallacy
of unqualified authority.
No response saved yet. Save Draft Submit ?
Point 5 in the Baloney Detection Kit asks whether anyone has
tried to disprove this claim. What does the video suggest
regarding this point?
No response saved yet. Save Draft Submit ?
Point 6 in the Baloney Detection Kit asks where the
preponderance of evidence seems to point. While this video
depicts conflicting claims, it suggests that most of the evidence
supports which side?
No response saved yet. Save Draft Submit ?
·
Top of Form
In the flashback to the 1984 news report, the newscaster
references a study conducted by a Florida researcher that
demonstrated that more murders were committed during a full
moon; Shermer then reveals that the study proved to be flawed.
Using one of the elements of good vs. bad science detailed
above, offer a theory as to what might have gone wrong in this
scientific study.
Explanations / 6.5 Statistics and Fallacies Questions: 0 of 3
complete (0%) | 0 of 2 correct (0%)
Statistics and Fallacies
Advice to waiters:
Referring to a patron by name will increase tips by 18 percent.
Statistics suggest a precision and certainty that is not always
warranted. Derived from gathering and analyzing data, statistics
usually involve making a calculation and generating a result in

12. a way that superficially resembles a math problem, which
implies the answer is as certain as the truth that 2 + 2 = 4.
But statistical claims are rarely worthy of this level of
confidence, and as critical thinkers we need to look closely at
how the data were gathered and analyzed. Below are some
common problems to watch out for.
Small Sample Size
Only 33 percent of nine-year-olds watch Arthur. I know because
I asked three nine-year-olds if they watch Arthur, and just one
of them said yes.
While it is technically true that one out of three is 33 percent, it
would be deceptive to suggest that this statistic can be
generalized broadly when the sample size is far too small to be
representative of the entire population of nine-year-olds.
Biased Sample
According to my research, 72 percent of Americans are pulling
for the Carolina Panthers. I know because I conducted a
scientifically valid survey in Charlotte, North Carolina.
If the sample group surveyed isn't representative of the
population at large in relevant ways, it would be misleading to
apply this statistic to the Americans in general.
Manipulative Survey Questions
Approximately 89 percent of Americans are in favor of federal
healthcare. I know because we conducted a scientifically valid
survey from a random sample of American households
controlling for 15 demographic variables. In each survey we
asked, "Would you prefer healthcare costs to rise while quality
drops, or would you prefer federal healthcare?"
Even if you know that a large and diverse pool of people have
been surveyed, if the wording of the question was ambiguous or
loaded, the reported statistic may be worthless.
Statistics Based on Guesswork
College students average 4.2 hours of study for every hour in
class, according to a study in which the participants were asked
about their study habits.
This problem plagues any study relying on the self-reporting of

13. participants without verification. Such studies assume that
people will always answer truthfully even when their answers
might implicate themselves as unethical, dishonest, criminal, or
engaged in thoughts or actions that flout cultural norms.
Missing Background Information
In the five years since the city built the new bike paths, the
annual total of bicycle accidents on the main roads has dropped
by 34 percent.
Are we talking about 150 bicycle accidents reduced to 100? Or
more like three accidents reduced to two? Without any
background information beyond the statistic, it's hard to truly
evaluate the impact the new bike paths may have had.
Answer the following questions about the material above.
Sharlene is supposed to poll people about their voting choices
for her American Government class. She asks four random
people on the street about their vote, and then reports to her
class that 75 percent of the city voted Republican. What is the
MOST obvious problem with her statistic?
· Background information is missing.
· The survey question is manipulative.
· The sample size is too small.
· The statistics are based on guesswork.
Save
To find out if members of the community are opposed to soft
drinks being sold in middle school cafeterias, Gregoire conducts
a survey asking, "Do you support the practice of schools
pushing the sales of substances known to lead to obesity and
heart disease onto impressionable minors?" After analyzing the
results, he concludes that 78 percent of people oppose the sale
of soft drinks. What is the problem with his statistic?
· Background information is missing.
· The sample is biased.
· The sample size is too small.
· The survey question is manipulative.
·
Top of Form

14. Imagine that you run across a statistic online claiming that men
are 25 percent more likely to ski on dangerous slopes than
women. Give examples of at least two pieces of information you
would want to know about this statistic before you would accept
it as fact.
Are you sure?
If you confirm, all of the multiple-choice questions you've
answered on this page will be reset, and your score for these
questions will return to zero.
Are you sure you want to proceed? If so, please press Reset
Answers.
Explanations / 6.6 Practice: Statistics and Fallacies Questions: 0
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Practice: Statistics and Fallacies
Is a Law Degree a Ticket to Wealth?
Some statistics are deliberately twisted and manipulated, and
some are complete fabrications. But even when a statistic comes
from a legitimate academic study and has no obvious problems
regarding sample size, bias, or manipulative wording, it doesn't
mean that your work as a critical thinker is finished. In the
following blog post, Burt Likko analyzes a statistic reported by
professors Michael Simkovic and Frank McIntyre in their paper
"The Economic Value of a Law Degree" and questions exactly
how much value we can place on it.
Read the article below, and then answer the following
questions.
Deception with Statistics
In the scenario the writer describes in the beginning, what are
law students most concerned about?
· whether they will have high levels of student debt
· whether they will be accepted into a prestigious law school
· whether they will pass the bar exam
· whether they will get well-paying jobs after they graduate
Save
The writer discusses a statistic about the economic value of a

15. law degree. Which types of people would MOST likely have a
personal investment in accurately understanding this statistic?
· people who hope to teach at a law school
· people who haven't previously considered going to law school
· people who used to work in law but have now switched
professions
· people who are evaluating whether going to law school will be
financially worth it
Save
The study analyzed by the writer arrived at which of the
following conclusions?
· Female law-school graduates are projected to earn more than
male graduates in their lifetimes.
· All law-school graduates earn $1,000,000 in their lifetimes.
· On average, people with law degrees will earn $1,000,000 in
their lifetimes.
· All graduates of the most prestigious law schools earn
$1,000,000 in their lifetimes.
Save
The writer criticizes Simkovic and McIntyre's paper because it
"fails to include some other big numbers." What "big numbers"
does the statistic avoid addressing?
· the difference between earnings in the 25th, 50th, and 75th
percentiles
· the costs of going to law school
· the income difference between men and women
· the lifetime earnings of the average law-school graduate
Save
What does the writer mean when he says, "There's a long tail
that comes after the tall head"?
· There is a small number of law-school graduates who make
very high salaries, but there is a far larger number of law-school
graduates who make significantly lower salaries.
· Law-school graduates have many long years of paying back
student loans after their three years of law school.
· The huge expense of going to law school will be followed by

16. long years of solid income to make up for it.
· Law-school graduates usually have to wait a long time before
they can get a job in their field.
·
Top of Form
Now that you've read the writer's evaluation of the claim that
"the mean pre-tax lifetime value of a law degree [is]
approximately $1,000,000,” explain whether or not you think
you think that statistic qualifies as "deceptive" and why.
Are you sure?
If you confirm, all of the multiple-choice questions you've
answered on this page will be reset, and your score for these
questions will return to zero.
Are you sure you want to proceed? If so, please press Reset
Answers.
Top of Form
Bottom of Form
Top of Form
Bottom of Form
Are you sure?
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answered on this page will be reset, and your score for these
questions will return to zero.
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Assignment 1
1) Following are elements of a WBS for a project to build a
bunk bed. Using the information supplied here, create a WBS
and carry out a bottom-up cost estimate.

20. Cost($)Rate ($/hr)Time (hrs)
Research: Jimmy' time12
Dad's time252
Materials: Lumber200
Hardware45
Power equipment rental65
Jimmy's time to acquire materials13
Dad's Time to acquire materials153
Construction:Jimmy's time18
Dad's time208
Inspection:Mom's time100.5
2) Following is a listing of items to be considered in costing a
PC game development project. Use this data to develop a
parametric estimate of the cost of the project.
Cost ($)Rates($/hr)Time (hr)
Resources: Designers 30100
Artists25200
Programmers251000
Work Station3000
Contracted Testing Group50100
Marketing Materials1500
Fringe benefits:30%of Direct Wages
Overhead:70%of (Direct Wages + fringes)
3) For the table below
TaskPredecessor
Duration
(in days)
Latest
start

21. Earliest
start
Float
(slack)
AStart5
BA,D8
CB9
DStart6
ED12
FStart12
GF7
a) Create a PERT/CPM chart
b) Identify the critical path and compute project duration
c) Compute Latest Start, Earliest Start, and Float (Slack)
1