Student's T-test


Student's T-test is a statistical hypothesis test that is used to determine if there is a significant difference between the means of two groups which may be related in certain features. It is a parametric test that assumes the data is normally distributed and the variances of the two populations are equal. The test calculates a T-value which is the difference between the means of the two groups divided by the standard error of the difference between means. The T-value is then compared to a critical value from the T-distribution with degrees of freedom equal to the sum of the sample sizes minus two. If the T-value is greater than the critical value, then the null hypothesis is rejected and it is concluded that there is a significant difference between the means of the two groups.


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