Look at your past surveys to check what your usual rate is. If you’re sampling a random population, a conservative guess is about 10% to 15% will complete the survey. And don’t forget that not everyone who receives the survey will respond: Your sample size is the number of completed responses you get.
Define the sample size Balancing the confidence level you want to have and the margin of error you find acceptable, your next decision is how many respondents you will need.This means measuring the margin of error and confidence level for your sample.
Decide what level of accuracy you’re aiming for You need to decide how much of a risk you’re willing to take that your results will differ from the attitudes of the whole target market.Define your total population This is the entire set of people you want to study with your survey, the 400,000 potential customers from our previous example.
