# Parents of teenage boys often

Parents of teenage boys often complain that auto insurance costs more, on average, for
teenage boys than for teenage girls. A group of concerned parents examines a random
sample of insurance bills. The mean annual cost for 36 teenage boys was \$679. For 23
teenage girls, it was \$559. From past years, it is known that the population standard
deviation for each group is \$180. Determine whether or not you believe that the mean cost
for auto insurance for teenage boys is greater than that for teenage girls. Test at the 5% level
of significance.

# Parents of teenage boys often

Parents of teenage boys often complain that auto insurance costs more, on average, for teenage boys than teenage girls. A group of concerned parents examines a random sample of insurance bills. The mean annual cost for 36 teenage boys was \$679. For 23 teenage girls, it was \$559. From past years, it is known that the population standard deviation for each group is \$180. Determine whether or not you believe that the mean cost for auto insurance for teenage boys is greater than that for teenage girls. (Set 1 for boy and Set 2 for girl.) Find the p-value of 2-sample-z-test.

# Parents of teenage boys often

Parents of teenage boys often complain that auto insurance costs more, on average, for teenage boys than teenage girls. A group of concerned parents examines a random sample of insurance bills. The mean annual cost for 36 teenage boys was \$679. For 23 teenage girls, it was \$559. From past years, it is known that the population standard deviation for each group is \$180. Determine whether or not you believe that the mean cost for auto insurance for teenage boys is greater than that for teenage girls. (Set 1 for boy and Set 2 for girl.) Decision and conclusion: Reject null hypothesis or do not reject null hypothesis?

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