Decide whether the population standard deviation is known or unknown.[br] Move the slider to record your decision.[br]Enter values for the sample mean, the population standard deviation, [br]the sample size and the confidence. If the population standard deviation[br]is unknown, use the sample standard deviation.[br][color=#ff0000]WARNING: Standard deviations should be positive numbers, sample sizes[br]should be positive integers - usually bigger than one, and confidence[br]percentages should be between 1 and 100 - usually bigger than 75. [/color]

Navidi and Monk, [i]Elementary Statistics[/i], 2nd edition, McGraw Hill Education, 2016, and Mario F. Triola, [i]Elementary Statistics Using The TI-83/84 Calculator[/i], 3rd edition, Addison-Wesley 2011 were used as references in the creation of this applet.