Suppose that you want to investigate whether men and women differ with regard to coffee consumption. You plan to ask people to indicate their sex and also to say whether they drink coffee every day, sometimes, or almost never.

a. Identify the two variables in this study. Also classify each variable as categorical or quantitative. For the categorical variable(s), also report how many categories are involved.

b. Could this study involve random sampling, random assignment, or both? Explain. Suppose that you collect survey responses on these questions for a sample of 70 students at your school. You then give the responses to your friend to ask him to tally them. He reports the following results back to you:

Sex: 38 men, 32 women

Coffee consumption: 22 every day, 22 sometimes,

 26 almost never

c. Does this provide enough information for you to investigate whether the sample data provide strong evidence that men and women differ with regard to coffee consumption? If not, describe what additional information is needed.