Question 450456: An automobile assembly line operation has a scheduled mean completion time, , of minutes. The standard deviation of completion times is minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of completion times under new management was taken. The sample had a mean of minutes. Assume that the population is normally distributed. Can we support, at the 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.
Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table.
The Null Hypothesis
The Alternate Hypothesis
Type of Test Statistic
Value of Test Statistic
P-Value
Can we support he calim that the mean completion time has decreased under new management?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! An automobile assembly line operation has a scheduled mean completion time
of (???) minutes. The standard deviation of completion times is minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of completion times under new management was taken. The sample had a mean of (???) minutes. Assume that the population is normally distributed. Can we support, at the 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.
Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table.
The Null Hypothesis
The Alternate Hypothesis
Type of Test Statistic
Value of Test Statistic
P-Value
Can we support he claim that the mean completion time has decreased under new management?
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Comment: You probably "copied and pasted" your post, so it is missing
essential numbers. Check out the (???) I have noted above.
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Cheers,
Stan H.
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