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A manager is interested in improving productivity at a plant by changing the layout of the workstation. For each of 10 workers, she measures the time it takes to complete a task before the change and again after the change. She calculates the following summary statistics for the sample difference: ¯ d = 8.5,sD = 11.38, and n = 10. Construct the 95% confidence interval for the mean difference, assuming that the productivity variable, before minus after, is normally distributed.
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Using the information from Example, can the manager conclude at the 5% significance level that there has been a change in productivity since the adoption of the new workstation?
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WHAT IS TEST STATISTIC FOR TESTING μ D?
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The nutritionist from Example also wants to use the data from the 40 Starbucks cardholders in order to determine if the posting of caloric information has reduced average food calories. This test is also conducted at the 5% significance level.
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WHAT IS CALCULATIONS FOR MSTR?
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WHAT IS CALCULATIONS FOR MSE?
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WHAT IS TEST STATISTIC FOR A ONE-WAY ANOVA TEST?
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Use Excel to obtain the ANOVA table for the public transportation example.
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