How do you find the P value for a two tailed test with n=21 and test statistic t =1.557? Statistics Inference with the z and t Distributions Two-sample t test 1 Answer VSH Dec 6, 2017 0.135 Explanation: Answer link Related questions What conditions must be met for conducting a two-sample t test for the means? What is the difference between using the pooled variance and the unpooled variance in a... Why is a pooled standard deviation used for a two sample t-test? What is a pooled variance? What is the mathematical formula for the pooled variance of two populations? Can a two-sample t-test be used if the samples are of a different size? Can a two-sample t-test be used if the samples have different variances? How do you adjust a two-sample t-test to accomodate samples of different sizes? What is Welch's t-test? When is Welch's t-test used? See all questions in Two-sample t test Impact of this question 6250 views around the world You can reuse this answer Creative Commons License