The distribution of hours worked per week by husbands in the United States in the early 1990s had mean 42.6 and standard deviation 12.9.
a. Tell whether 42.6 is a sample or population mean, and identify it with proper notation.
b. Without actually calculating values of z, tell whether each of these sample means (for a sample of any size) will have a positive or negative standardized score: 40, 50, 38, 37.
c. Without actually calculating values of z, tell which one of these sample means (for a sample of any size) will have the most extreme and which will have the least extreme standardized score: 40, 50, 38, 37.