Confidence Interval for the Mean Calculator
Decide whether the population standard deviation is known or unknown.
Move the slider to record your decision.
Enter values for the sample mean, the population standard deviation,
the sample size and the confidence. If the population standard deviation
is unknown, use the sample standard deviation.
WARNING: Standard deviations should be positive numbers, sample sizes
should be positive integers - usually bigger than one, and confidence
percentages should be between 1 and 100 - usually bigger than 75.
Navidi and Monk, Elementary Statistics, 2nd edition, McGraw Hill Education, 2016, and Mario F. Triola, Elementary Statistics Using The TI-83/84 Calculator, 3rd edition, Addison-Wesley 2011 were used as references in the creation of this applet.