1. PSYC 354 HOMEWORK 3 Central Tendency and Variability
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Fill in the highlighted blanks to answer/complete the
The arithmetic average of a set of numbers is the mean.
2) What is an outlier?
3) Which widely-used measure describes the typical
amount or distance a score deviates from the mean in
any given distribution?
3. Standard Deviation (-2) – correction from
4) What is the mathematical relationship between
variance and standard deviation?
Part I: Concepts
These questions are based on the Nolan and Heinzen reading and end-of-chapter
For the following terms, write the equivalent mathematical symbol (letter or letters) for the
These are the winning percentages for 11 baseball players for each one’s best 4-year pitching
6-c ) Compare the mean and median. Does the difference between them suggest that the
data are skewed very much?
6-a) What is the mean of the scores? (Compute this using a calculator):
6-b) What is the median of these scores?
2. Recall the interactive graph from Homework 2 depicting household income and location in
Based on this module/week’s reading, why do you think the author of this graph chose the
median household income instead of the mean household income to describe central
Part II: SPSS Analysis
Green and Salkind Course Text, Lesson 21: Exercises 1, 4, 7, and 8
• Questions 1 and 4
o Green and Salkind Text, Lesson 21
o Lesson 21 Exercise File 1 (located under course’s Assignment Instructions folder)
Exercises 1a-1d and Exercise 4
Green and Salkind, Lesson 21, Exercises 1 and 4
Open “Lesson 21 Exercise File 1” in order to complete these exercises.
Part III: SPSS Data Entry and Analysis
The steps will be the same as the ones you have been practicing in Part I of the assignment; the
only difference is that you are now responsible for creating the data file, as well. Remember to
do the following:
a) Name and define your variables under the Variable View, then return to the Data View to
enter the data; and
b) Paste all SPSS output and graphs into your homework file at the appropriate place.
Part III: Questions 1-4
The following data are taken from the Bureau of Labor Statistics surveys from the years 2009–
2013. They represent the average weekly pay for wage and salary earners measured at 4 different
quarters each year and broken down by gender.