# Two sample mean hypothesis test

Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day shift. A sample of 54 day-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed that the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level, is the number of units produced on the afternoon shift larger?

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Units Produced Day shift Afternoon Shift

Average 345.00 351.00

Standard Deviation 21.00 28.00

Number of ...

#### Solution Summary

Explains how to conduct hypothesis testing for two-sample mean by providing step-by-step description. It includes hypothesis writing, determining the type of test (t test or z test; one-tail or two-tail), calculating test statistic, calculating critical value and making inferences about the final outcome.