Assumptions for the one sample t test are as follows: The data in the variables of interest should be continuous.This means they take any numeric value, such as age in years, weight in kilograms or ...

The t-test calculation uses three data: the difference between the mean values from each data set, the standard deviation of each group, ... Paired Sample T-Test Formula .

Paired Sample T-Tests Consider a data file named BeforeAfter.txt that has contents: before,after 70,72 83,85 . . . 90,91. Each row represents the math exam scores of a student before and after some ...

Robustness and Power of the t-Test This applet allows users to change the distributions of two populations, and to view the resulting distribution of test statistics arising from simulation results.

If the sample variance remained constant, to reach the 52% power, the two-sample test would require larger samples (n = m = 7). When assumptions are met, the two-sample t -test is the optimal ...