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 ...
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.