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annually in its leased cars is 13 520 miles with a standard deviation of 1820 miles The company recently starting using new contracts which require customers to have the cars serviced at their own expense The company s owner believes the mean number of miles driven annually under the new contracts is less than 13 520 miles He takes a random sample of 14 cars under the new contracts The cars in the sample had a mean of 13 006 annual miles driven Assume that the population is normally distributed Is there support for the claim at the 0 10 level of significance that the population mean number of miles driven annually by cars under the new contracts is less than 13 520 miles Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts Perform a one tailed test Then complete the parts below Carry your intermediate computations to three or more decimal places and round your responses as specified below If necessary consult a list of formulas a State the null hypothesis Ho and the alternative hypothesis H Ho O H 0 b Determine the type of test statistic to use Choose one c Find the value of the test statistic Round to three or more decimal places d Find the critical value Round to three or more decimal places 0 e Can we support the claim that the population mean number of miles driven annually by cars under the new contracts is less than 13 520 miles OYes No H XI a S 0 0 Oso X 0 P Q 010 020 O O

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