Areporter compared the scores of two basketball teams over the past year. when she listed the scores, she found the lists had the same measure of center but different measures of spread. which statement could describe the two teams’ lists of scores?
they have the same means but different medians.
they have the same medians but different interquartile ranges.
they have the same interquartile ranges but different ranges.
they have the same ranges but different means.

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.