Mann-Whitney Test in Excel Using QI Macros
When to Use the Mann-Whitney Test
A Mann-Whitney test (equivalent to Wilcoxon Rank Sum Test) compares the differences between two independent samples to determine if they differ in location.
A professor wants to compare the grades of students who attended live lectures vs video-taped lectures. Scores of students attending video lectures is in column A; live lectures in column B.
To conduct a test using QI Macros he will:
- Click on QI Macros menu, Stat Templates and then Mann Whitney.
- Input the data for Sample 1 (Video Taped Lectures) into column A and the data for Sample 2 (Live Lectures) into column B.
- QI Macros will perform the calculations and display the results in columns C:G
- QI Macros will also interpret the results for you. Cell F7 indicates that we cannot reject the null hypothesis.
Interpreting the Mann Whitney Test Results: Since p (0.758) is greater than alpha (0.05) we cannot reject the null hypothesis that video instruction is as good as live instruction.
Tip: If you enter more than 50 rows of data, in either column A or B, make sure to extend the formulas found in both columns C and D. To do so, select cells C50 and D50. Then, click on the bottom-right corner of cell D50 and drag down to reflect the additional rows found in your data set (1). This will populate the additional rows with the necessary formulas (2).
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