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An automobile assembly line operation has a scheduled mean completion time,u , of 13.5 minutes. The standard deviation of completion times is 1.7 minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of 50 completion times under new management was taken. The sample had a mean of 13.2 minutes. Can we support, at the 0.05 level of significance, 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 one-tailed test. Then fill in the table below.

Please answer the following:

Ho=

H1=

The type of test statistic; z,t, chi square, f?

The value of the test statistic ?

The p value?

Can we support the claim that the mean completion time has decreased under new management?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9390538

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