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Chapter 11: Q. 36 (page 725)

Does eating chocolate trigger headaches? To find out, women with chronic headaches followed the same diet except for eating chocolate bars and carob bars that looked and tasted the same. Each subject ate both chocolate and carob bars in random order with at least three days between. Each woman then reported whether or not she had a headache within 12hours of eating the bar. Here is a two-way table of the results for the 64subjects:

The researchers carried out a chi-square test on this table to see if the two types of bar differ in triggering headaches. Explain why this test is incorrect.

Short Answer

Expert verified

The two types of bars differ in triggering headaches because independent requirement not met.

Step by step solution

01

Given information

The given data is

02

Explanation

Because each row contains data about the same subjects, the rows are not independent.

We can't use the chi-square test because the Independent criterion isn't met.

Independent requirement not met.

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