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Before changes to its management staff an automobile assembly line operation had a scheduled mean completion time of 14 9 minutes The standard deviation of completion times was 1 7 minutes An analyst at the company suspects that under new management the mean completion time is now less than 14 9 minutes To test this claim a random sample of 80 completion times under new management was taken by the analyst The sample had a mean of 14 6 minutes Can we support at the 0 10 level of significance the claim that the population mean completion time under new management is less than 14 9 minutes Assume that the population standard deviation of completion times has not changed under new management 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 H 0 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 e Can we support the claim that the population mean completion time under new management is less than 14 9 minutes x 9 a X S 0 0 OSO 06 O p Q P olo WE O O

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