Find labor charge for repair at an automobile service center

Reference no: EM131813594

Question: The labor charge for repairs at an automobile service center are based on a standard time specified for each type of repair. The time specified for replacement of universal joint in a drive shaft is one hour. The manager reviews a sample of 30 such repairs. The average of the actual repair times is 0.86 hour with standard deviation 0.32 hour.

a. Test at the 1% level of significance the null hypothesis that the actual mean time for this repair differs from one hour.

b. The sample mean is less than one hour, suggesting that the mean actual time for this repair is less than one hour. Perform this test, also at the 1% level of significance. (The computation of the test statistic done in part (a) still applies here.)

Reference no: EM131813594

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