Question

An automobile assembly line operation has a scheduled mean completion time, μ, of 12.8 minutes. The standard deviation of completion times is 1.5 minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of 34 completion times under new management was taken. The sample had a mear of 12.6 minutes. Assume that the population is ם ornally distributed. Can we support, at the 0.OSee.otsionneance, the claim that the mean completion time has decreased under new management? Assume that the standard deviation of completion times has not changed. Perform a ฉaetailed test. Then nil in the table below. Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. (If necessary, consult a list of formulas.) The puil hypothesis The aternatives hvaoD The type of test statistic:Choose one The value of the test statistic: (Round to at least three decimal places.) The p-value: (Round to at least three decimal places.) Can we support the claim that the mean completion O Yes O No time has decreased under new management?

Answer 1