Cancer A group of investigators wishes to explore the relationship between the u

Question

Cancer A group of investigators wishes to explore the relationship between the use of hair dyes and the development of breast cancer in females. A group of 1000 beauticians 30-39 years of age is identified and followed for 5 years. After 5 years, 20 new cases of breast cancer have occurred. Assume that breast- cancer incidence over this time period for an average woman in this age group is 7/1000. We wish to test the hypothesis that using hair dyes increases the risk of breast cancer. 7.27 Is a one-sided or two-sided test appropriate here?

Explanation / Answer

7.27 We wish to test the hypothesis that using hair dyes increases the risk of breast cancer or not. So, one sided test will be appropriate here. Two sided test will be approprite when we want to test if sample proportion is equal to population proportion or not.

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