3 calculators in this category
- Confidence Interval Calculator for a MeanStudent's t distributionThis calculator builds a confidence interval for a population mean from three numbers you already have: the sample mean, the…
- Margin of Error CalculatorNormal approximation with finite population correctionThe margin of error is the “plus or minus” attached to a survey result: the half-width of the confidence interval around your…
- Survey Sample Size CalculatorCochran's sample size formulaThis calculator tells you how many completed survey responses you need to hit a target margin of error at a chosen confidence…
Which one do you need?
- Confidence Interval Calculator for a Mean
- Build a 90%, 95% or 99% confidence interval for a population mean from your sample mean, standard deviation and sample size, with the full t or z working shown.
- Margin of Error Calculator
- Calculate the margin of error for a survey percentage or a mean at any confidence level, with the finite population correction and the full working shown.
- Survey Sample Size Calculator
- Work out how many survey responses you need for a target margin of error and confidence level, with the finite population correction and a response-rate adjustment.
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