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Mean Confidence Interval Calculator. The confidence interval also called margin of error is the plus-or-minus figure usually reported in newspaper or television opinion poll results. The population parameter in this case is the population mean mu. Compute confidence intervals around continuous data using either raw or summary data. The calculator on this page solves confidence intervals for one population mean.
For example if you use a confidence interval of 4 and 47 percent of your sample picks an answer you can be sure that if you had asked the question of the entire relevant. Confidence Interval Confidence Level. Evaluating NPS Confidence Intervals with Real-World Data. Next you need to determine the z-score. X1 sample 1 mean s1 sample 1 standard deviation n1 sample 1 size x2 sample 2 mean s2 sample 2 standard deviation n2 sample 2 size Confidence level. 99 95 90 85 80 75 70 65 60 55 50.
If the hypothesized value of the population mean is outside of the confidence interval we can reject the null hypothesis.
Confidence interval for a mean This calculator includes functions from the jStat JavaScript library. Sample Size n. Knowing the confidence interval for the mean of a normal population can be very useful for assessing the true nature of a population variable in analytics studies that use normally distributed sample data. This tutorial explains the following. Enter how many in the sample the mean and standard deviation choose a confidence level and the calculation is done live. Confidence limits are the numbers at the upper and lower end of a confidence interval CI.