This calculator is used to find the confidence interval (or accuracy) of a mean given a survey's sample size, mean and standard deviation, for a chosen confidence level.
How To Interpret The Results
For example, suppose you carried out a survey with 200 respondents. If you had a mean score of 5.83, a standard deviation of 0.86, and a desired confidence level of 95%, the corresponding confidence interval would be ± 0.12. That is to say that you can be 95% certain that the true population mean falls within the range of 5.71 to 5.95.