![]() NIST table with the most common levels of significance and degrees of freedom. ![]() Generally applied with sample sizes <30.Ĭlick here to learn more about the t-distribution and t-tests with examples.į-Distribution: Percentage points of the F-Distribution As the sample size increases it becomes taller and narrower and exhibits more characteristics of the normal curve. The t-distribution is a series of distributions, a unique distribution exist for each sample size. Population standard deviation is unknown.The t-distribution is used instead of the z-distribution ( standard normal distribution) when the: T-Distribution: Critical values from the t-Distribution For the t-distribution, dF = n-1, represents the degrees of freedom. Share Facebook Twitter WhatsApp t-distribution
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