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Sample Size Estimation (Mean)

Hint: Use this calculator to estimate the Sample Size for a given Margin of Error (Acceptable Difference) for continuous data (mean). E.g. You want to check the average time for a transaction and your research shows a standard deviation of 2.5 in the transaction time. You are okay if your survey result is ±5% of actual mean. How many transactions will you monitor to be 95% sure that the average time is correct?

  • In the above example it is 95%
  • This is the historic or the researched standard deviation. In the above example, it is 2.5
  • or the Margin of Error. In above example it is 5%. Just enter 5