Identify the statistical procedure that should be used to analyze the data from each of the following studies:
a. A study that investigates whether men or women (age 16 to 20) spend more money on clothing. Assume the amount of money spent is normally distributed.
b. In the (a) study, it has since been determined that the amount of money spent really is not normally distributed.
c. A study that investigates the frequency of drug use in suburban versus urban high schools.
d. A study that investigates whether students perform better in a class that uses group learning exercises versus a class that uses the traditional lecture method. Two classes that learn the same information are selected. Performance on a 50 item final exam at the end of the semester is measured.