Calculate the value of the test statistic of the mean age

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Reference no: EM1321145

Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The standard deviation of this sample was 2.8 years. At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students?

a. Compute the value of the test statistic.

b. What is the critical value of the test statistic.

Reference no: EM1321145

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