# Sign Test in Excel using QI Macros

## QI Macros Add-in Makes it Easy to Conduct a Sign Test in Excel

Use a Sign Test when you have paired data (e.g., before and after). The null hypothesis is that the before and after are the same.### Sign Test Example Using QI Macros

Imagine that you have 15 intersections where you record the number of accidents before and after the installation of a traffic control device.

Enter the data and median into QI Macros sign test template. To open the template, click on the QI Macros menu > Stat Templates > Sign Test, and then chose the "Sign test" tab. You can then enter your data into the Sign Test:

The "before" accidents are in column A and the "after" in column B. The template calculates a p value.

**Hypothesis Test Results:** In this case, reject the null hypothesis, because the p value, 0.046 is less than alpha = 0.05. In other words, the traffic control device did reduce accidents.

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