# Test of a Proportion in Excel

## QI Macros Proportion Test Template for Excel

Use our proportions test template to compute a confidence interval and perform a hypothesis test of the proportion.

### QI Macros Add-in for Excel installs a new tab on Excel's menu.

Just click on QI Macros menu to open a number of Statistical Templates.

### Test of Proportion Example Using QI Macros template:

Let's say a manufacturer claims that his products are less than 3% defective. You can take a sample of the products and determine whether or not the actual percent defective is consistent with his claim.

1. If the sample data isn't summarized, use PivotTables to summarize the trials and successes
2. To open the template, click on QI Macros -> Stat Templates -> 1-2 Proportion Tests:
3. Enter desired proportion in A3. The number should be between 0 and 1. (e.g., 3% is 0.03)
4. Enter number of trials in B3 (100 products)
5. Enter number of successes in C3 (e.g., defects in 100 products)
6. Enter confidence Level in E1 (.95 = 95%)
7. Null hypothesis is H1=H0 (sample proportion = proportion). p values are calculated via direct and normal approximation methods for H1<>H0, H1>H0 and H1<H0.
• If Cell H3:H5 (or J3:J5) is green: Cannot reject the null hypothesis
• If Cell H3:H5 is red: Reject the null hypothesis

In this example with five defects in 100 samples, you cannot reject the null hypothesis.

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