The length of human pregnancies has an average of 266 days and a standard deviation of 16 days. The data is from a so it is a • The • = 266, and the = 16 A random sample of 9 pregnant women was observed to have an average pregnancy length of 270 days, with a standard deviation of 14 days. The data is from a so it is a The . = 270, and the = 14