Sample Size and Confidence Interval

This interactivity will allow you to input any three of the following four quantities, then it will calculate and display the fourth.

  • Confidence level
  • Half width
  • Standard deviation
  • Sample size

Instructions
  • Enter values for three of the four values.
  • Click "Calculate Missing Value" to calculate and display the missing value.
  • Once the missing value is displayed, you can enter a sample mean and click "Show Graph" to see the sample mean and the bounds of the confidence interval.
  • To restore the default values, click "Reset".

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