Hellers manufacturers lawn mowers. Two different procedures have been proposed for mounting the engines on the frame of the lawnmower. Procedure 1 was developed by a longtime employee. Procedure 2 was developed by Heller's vice-president of engineering. A sample of 5 employees was timed using procedure 1, and the same five employees were timed using procedure 2. You want to test whether Procedure 1 takes less time than Procedure 2, on average. True or False

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An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. 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.

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