The conversion of the data from this problem into a form suitable for the point-biserial correlation (use 1 for the noncontact athletes and 0 for the contact athletes), and then compute the correlation. Square the value of the point-biserial correlation to verify that you obtain the same r 2 value that was computed in Chapter 10 i.e. r 2 = 0.265 .

Question

Suppose we wish to test the hypothesis that women with a sister’s history of breast cancer are at higher risk of developing breast cancer themselves. Suppose we assume that the prevalence rate of breast cancer is 3% among 60- to 64-year-old U.S. women, whereas it is 5% among women with a sister history. We propose to interview 400 women 40 to 64 years of age with a sister history of the disease. What is the power of such a study assuming that the level of significance is 10%? I only need help writing the null and alternative hypotheses.

Answer 1

Question

Chapter 15, Problem 22P

To determine

The conversion of the data from this problem into a form suitable for the point-biserial correlation (use 1 for the noncontact athletes and 0 for the contact athletes), and then compute the correlation.
Square the value of the point-biserial correlation to verify that you obtain the same r 2 value that was computed in Chapter 10 i.e. r 2 =0.265 .

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