Performs unpaired t test, Weldh's t test (doesn't assume equal variances) and paired t test. Calculates exact P value and 95% confidence interval. Clear results with links to extensive explanations.

In this article you will learn the requirements and assumptions of a one sample t test, how to format and interpret the results of a one sample t test, and when to use different types of t tests.

Analyze continuous data Descriptive statistics, detect outlier, t test, CI of mean / difference / ratio / SD, multiple comparisons tests, linear regression. Descriptive statistics and confidence interval of a …

This calculator compares observed and expected frequencies within (up to 20) categories using the chi-square test. Enter the names of the categories into the first column, then enter the actual counts …

Free web calculator provided by GraphPad Software. Calculates the P value from z, t, r, F, or chi-square.

Descriptive statistics, detect outlier, t test, CI of mean / difference / ratio / SD, multiple comparisons tests, linear regression.

The calculator will compare the means to ask whether the observed differences are likely to be due to coincidence. Enter either raw data (enter each value) or averaged data (enter mean, N and SD or …

Free web calculator provided by GraphPad Software. Performs Grubbs' test Extreme Studentized Deviate (ESD) method. Clear results with links to extensive explanations.

The calculator above will graph and output a simple linear regression model for you, along with testing the relationship and the model equation. Keep in mind that Y is your dependent variable: the one …

This calculator is for 2x2 contingency tables that separate each subject into one of four categories based on two factors, each with two possibilities. Simply label the rows and columns, then type in the …