Before changes to its management staff, an automobile assembly line operation had a scheduled mean completion time of 14

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Before Changes To Its Management Staff An Automobile Assembly Line Operation Had A Scheduled Mean Completion Time Of 14 1 (46.59 KiB) Viewed 118 times

Before changes to its management staff, an automobile assembly line operation had a scheduled mean completion time of 14,8 minutes. The standard deviation of completion times was 1.4 minutes. An analyst at the company suspects that, under new management, the mean completion time, Hy is now less than 14.8 minutes. To test this daim, a random sample of 17 completion times under new management was taken by the analyst. The sample had a mean of 14.2 minutes. Assume that the population is normally distributed. Can we support, at the 0.10 level of significance, the claim that the population mean completion time under new management is less than 14.8 minutes? Assume that the population standard deviation of completion times has not changed under new management Perform a one-tailed best. 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 formules.) (a) state the nult hypothesis H, and the alternative hypothesis Hy o P X X 5 (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) DOS OD Dwa DHOOD X (a) Find the p-value: (Round to three or more decimal places) D e) Can we support the claim that the population mean completion time under new management is less than 148 minutes? Yes No