## Significant difference calculator between proportions

Check if the observed difference between two samples is significant regarding a percentage or a proportion. For example, you have two online advertisements to engage users in your web, A and B. You show each advertisement to 1.000 people and A advertisement gets 10,5% of sales conversion and B gets 11%. How can you determine if this difference was by chance or advertisement A was really better? By doing a test of significance. You have more info in the following post.

To use the calculator:

- Enter the sample size and the observed % for the sample 1.
- Do the same with sample 2.
- Enter which confidence level you want in order to prove that the observed difference is not by chance. A larger confidence level requires a larger observed difference.
- ...so there it is! Result is re-calculated each time you modify the different parameters. The calculator evaluates if the difference is significant and which is the minimum difference you have to observe to get this significance.

**Is this difference significant?**

**The minimum difference to state with a confidence of 95% it is significant is: is: ****%**