Determine Sample Size Calculator. Note that this sample size calculation uses the Normal approximation to the Binomial distribution. Determine the confidence interval.
Choose the required confidence level from the dropdown menu. You can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed. 2 days ago How to calculate sample size using Andrew Fishers Formula.
If the sample proportion is close to 0 or 1 then this approximation is not valid and you need to consider an alternative sample size calculation method.
This is the minimum sample size you need to estimate the true population. Choose the required confidence level from the dropdown menu. Why is 30 the minimum sample size. So for your email send if you have one control and one variation youll need to double this number.
