Frequency distributions

Dr. Mark A. McGinley BIOL 5311 Spring 2011 Frequency Distributions

Graphs ,[object Object],[object Object]

Frequency Distributions ,[object Object],[object Object],[object Object],[object Object]

Frequency Distributions ,[object Object]

Frequency Distribution: Abundance ,[object Object],[object Object],[object Object]

Birds Sparrow Blue Jay Grackle Hawks

Data Number of birds counted Sparrow 10 Blue jays 10 Grackles 10 Hawks 10

Frequency Distribution ,[object Object],[object Object],[object Object],[object Object],[object Object]

Frequency Distribution Species Number of individuals

Turning Graphs into Words ,[object Object],[object Object]

Describing a Frequency Distribution ,[object Object],[object Object],[object Object],[object Object]

Let’s use math to help us answer some questions about the birds in the woods ,[object Object],[object Object]

Lets Try Another Sample 2 nd Sample Number of birds counted Sparrows 12 Blue jays 4 Grackles 6 Hawks 2

Draw frequency distribution 2 nd Sample Species Number of individuals

Turn the frequency distribution into words ,[object Object]

Let’s use math to help us answer some questions about the birds in the woods ,[object Object],[object Object],[object Object],[object Object]

Comparing the two samples Species Number of Individuals

Let’s compare the 1 st and the 2 nd sample ,[object Object],[object Object]

Are you ready to practice one more time? Number of birds counted Sparrows 14 Blue jays 6 Grackles 8 Hawks 5 Mockingbirds 1 warblers 14

Now you are ready to conduct your own study. ,[object Object],[object Object],[object Object],[object Object]

Here’s a suggestion ,[object Object],[object Object]

How many brothers and sisters do you have Number of brothers and sisters Number of individuals 0 1 2 3 4 5 6 7 or more

Here is an example of what the data might look like Number of brothers and sisters Number of individuals 0 xxxx 1 xxxxxxx 2 xxxxxxxx 3 xxxx 4 xx 5 xxx 6 x 7 or more xx

What should you do next? ,[object Object]

Count the number of Xs in each row Number of brothers and sisters Number of individuals 0 xxxx 4 1 xxxxxxx 7 2 xxxxxxxx 8 3 Xxxx 4 4 Xx 2 5 Xxx 3 6 X 1 7 or more Xx 2

Now you are ready to make the frequency distribution Number of Brothers and Sisters Number of individuals

Let’s use math to answer some questions. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Frequency distributions

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