Comparing Two Groups

See the attached Commissions.xlsx datafile. In the file is a global sample of 200ish Shoe Sales Associates whose 3 most recent annual sales commissions are recorded.

1) Calculate the meancommissions for the past 3 years. Which year was the highest and lowest?
2) Graph those annual means with a pivot chart.
3) Figure out which year(s) sales persons’ made more money by comparing the difference between 2012 to 2013, 2013-2014, and 2012-2014. Since each row belongs to a specific sales person, you need to do a specific analysis – what is it?

What does the statistical significance value tell about those annual differences?

Thinking creatively, what do you think can account for those annual differences?

This solution provides step by step calculations and explanations in an Excel file on performing data analysis, by finding the mean and building a pivot chart. Finally, an ANOVA test is performed where the sum, average and variance are calculated to produce the F statistic, which is then compared to the p-value.