Statistical Analysis - Analysis of variance
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Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group.
(a) Make a bar chart and describe it.
(b) Calculate expected frequencies for each class.
(c) Perform the chi-square test for a uniform distribution. At α = .01, does this sample contradict the assumption that readership is uniformly distributed among these six age groups?
Purchaser Age Units Sold
18-24 38
25-34 28
35-44 19
45-54 16
55-64 10
65+ 9
Total 120
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Solution Summary
This solution loos at the age groups who purchase Cosmopolitan. It calculates the expected frequency for each age group and performs a chi-square test for uniform distribution.
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