Suppose that 100 Caucasian and 150 African American subjects are actually enrolled in the study. How much power would the study have to detect a 5-mg/dL mean difference using a two-sided test with α = .05?

Cardiovascular Disease

A study of genetic factors related to coronary heart disease (CHD) was performed as a substudy within the ARIC Study [20]. The data in Table 8.35 were provided by ethnic group for high-density lipoprotein (HDL) cholesterol (mg/dL).

Table 8.35: Mean HDL cholesterol (mg/dL) by ethnic group

 

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African-American Caucasian 55.3 17.2 3167 Mean sd 51.1 16.8 9389