9. marisol is trying to decide which job to take. she is offered three jobs. the store manager has a salary of $32,500. the
shoe clerk sells an average of $140,000 and is paid $6.00 per hour with a 15% commission. the department manager
gets paid $16.00 hour. all of the jobs require her to work 8 hours a day for 250 days. which job will make her the
most money?
a. the store manager job
b. the sales clerk job
c. the department manager job
d. the store manager and the department manager make the same

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.