Mr. lee received a raise at a job this year, but he finds that he has less money to spend each month. what is the most likely reason for this situation?
a. the supply of goods and services has risen
b. unemployment has dropped across the country
c. mr. lee is buying more expensive goods
d. inflation was greater than mr. lee's raise

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.