Two online retailers offer a particular style of webcam for sale. The prices of these cameras vary day by day. Consider two groups: Group #1 consists of consumers who purchased a camera from retailer #1 during the past three months and Group #2 consistes of consumers who purchased a camera from retailer #2 during the same period of time. A 99% confidence interval for12

12, the difference in population mean sale prices, is30 to 60dollars.

(a) The confidence interval would tend tosupportthe claim that, on average, consumers who purchased a camera from retailer #1 spent __________ dollars more than those who purchased a camera from retailer #2.

A.at least 25

B.at least 32

C.more than 65

D.less than 20

E.at most 40

(b) The confidence interval providesno strong evidenceto support or refute the claim that, on average, students who purchased a camera from retailer #1 spent __________ dollars more than those who purchased a camera from retailer #2.

A.at least 20

B.less than 65

C.more than 25

D.more than 50

E.at most 70