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Chapter 1: Q. 77. (page 53)

Birth months Imagine asking a random sample of 60 students from your school about their birth months. Draw a plausible (believable) graph of the distribution of birth months. Should you use a bar graph or a histogram to display the data?

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Birth months Imagine asking a random sample of 60 students from your school about their birth months

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01

Given information.  

Birth months Imagine asking a random sample of 60 students from your school about their birth months

02

you use a bar graph or a histogram to display the data.

Because the months are categorical, you should use a bar graph (histogram requires that the variable is numerical).

The width and height of the bars must be proportional to the number of students.

We expect the 60 students in the sample to be evenly distributed across all months, so there should be approximately 60/12=5 students per month.

Let the frequencies of the number of students born in the corresponding month be, for example:

BirthFrequency
January5
February6
March5
April4
May5
June5
July5
August4
September5
October5
November6
December5

The corresponding bar graph is then displayed.

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