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Use our online statistical calculator to calculate the p-value of the Student's t-distribution. You just need to enter the t-value and degrees of freedom and specify the tail. In addition to the p-value, you can get and download the graph created with our graph generator.
T Distribution Graph Generator. Instructions: Make a t-distribution graph using the form below. Please type the number of degrees of freedom associated to the t-distribution, and provide details about the event you want to graph: Number of Degrees of Freedom (df df) Two-Tailed: ≤ t ≤. Left-Tailed:
Note: This creates the graph based on the shape of the normal curve, which is a reasonable approximation to the t-distribution for a large sample size. These graphs are not appropriate if you are doing a t-distribution with small sample size (less than 30).
Use a two-tailed t-test if you only care whether the population's mean (or, in the case of two populations, the difference between the populations' means) agrees or disagrees with the pre-set value. Use a one-tailed t-test if you want to test whether this mean (or difference in means) is greater/less than the pre-set value.
Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.
StatDistributions.com - Student's t-distribution calculator. Enter either the p-value (represented by the blue area on the graph) or the test statistic (the coordinate along the horizontal axis) below to have the other value computed.
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.
