Choose a test for each situation: one-sample t-test, twosample t-test, paired t-test, and no t-test.

a. A researcher goes to a clothing store and observes whether each person is male or female and whether they return the clothes to the correct racks (yes or no) after trying them on.

b. A random sample of restaurants is obtained. Then the researcher walks into each restaurant wearing ordinary clothes and finds out how long it takes (in minutes) for a waiter to approach the researcher.

Later, the researcher goes into the same restaurant dressed in expensive clothes and finds out how long it takes for a waiter to approach.

c. The supervisor observes the number of working hours of a random sample of part-time workers and a random sample of regular workers.