Implement the test in Problem 11.39 for Caucasian boys, and report a two-sided p-value?

Pediatrics, Cardiovascular Disease

An important area of investigation is the development of strategies for altering cardiovascular risk factors in children. Low-density lipoprotein (LDL) cholesterol has consistently been shown to be related to cardiovascular disease in adults. A study was conducted in Bogalusa, Louisiana, and Brooks County, Texas, to identify modifiable variables that are related to LDL cholesterol in children [15]. It was found that the correlation coefficient between LDL cholesterol and ponderal index [weight (kg)/height3 (cm3)], which is a measure of obesity, was .28 among 903 Caucasian boys and .14 among 474 African American boys.