Statistics Tools

This calculator automatically finds the value for Sxy for a linear regression model based on the x values and y values in…

In statistics, Sxx represents the sum of squared deviations from the mean value of x. This value is often calculated when fitting…

A two sample z-test is used to test whether or not the means of two populations are equal when the population standard…

A one sample z-test is used to test whether or not the mean of a population is equal to some value when…

An F-test is used to test whether two population variances are equal.. To perform an F-test for two samples, simply enter a…

A tolerance interval is a range that is likely to contain a specific proportion of a population with a certain level of…

This calculator finds the area to the right of a certain z-score in the normal distribution. Simply enter the z-score below and…

This calculator finds the area to the left of a certain z-score in the normal distribution. Simply enter the z-score below and…

Simpson’s Diversity Index is a way to measure the diversity of species in a community. To calculate this index for a given…

In statistics, x-bar (x) is a symbol used to represent the sample mean of a dataset. To calculate x-bar for a given…