Border Wars As the costs of prescription drugs escalate, more and more senior citizens are ordering...

Border Wars As the costs of prescription drugs escalate, more and more senior citizens are ordering prescriptions from Canada, or actually crossing the border to buy prescription drugs. The price of a typical prescription for nine best-selling drugs was recorded at randomly selected stores in both the United States and in Canada.¹⁸

Drug	U.S.	Canada
Lipitor®	$290	$179
Zocor®	412	211
Prilosec®	117	72
Norvasc®	139	125
Zyprexa®	571	396
Paxil®	276	171
Prevacid®	484	196
Celebrex®	161	67
Zoloft®	235	156

a. Is there sufficient evidence to indicate that the average cost of prescription drugs in the United States is different from the average cost in Canada? Use a = .01.

b. What is the approximate the p-value for this test? Does this confirm your conclusions in part a?