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Measuring Differences Between Two Means: Hypothesis Testing

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Measuring Differences Between Two Means

Over the past year, the Vice President of Human Resources at a large medical center has run a series of three-month workshops aimed at increasing worker motivation and performance. To check the effectiveness of the workshops, she selected a random sample of 35 employees from the personnel files and recorded their most recent annual performance ratings, along with their ratings prior to attending the workshops.

Go to the Resources section in this syllabus and open the file perform.xls. The results in Panels A and B provide both descriptive and inferential information so that you can analyze the results and examine the assumptions of the hypothesis test to be used in your assessment. Your objective is to determine if there was a statistically significant difference in mean scores before and after the workshops. Clearly state your findings in a report to the Vice President of Human Resources. Make sure to state the null and alternative hypotheses, your statistical decision based on the outcomes (reject or fail to reject the null), and your pragmatic interpretation of the results.

Please copy and paste your statistical output and answers in a word processing file.

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