10.122 Border Wars As the costs of prescription drugs escalate, more and more American 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.

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 =0.01.

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

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Drug U.S. Canada Lipitor $290 $179 Zocor 412 211 Prilosec 117 72 Norvasc 139 125 Zyprexa 571 396