Basic Sample Stats. This unit will calculate the basic summary statistics for a sample of n values of X. Resampling Probability Estimates for the Difference Between the Means of Two Independent Samples. All statistical procedures should be prefaced by the phrase "Caveat Emptor," and that is especially true of this one. Given two independent samples of sizes n_a and n_b, this unit will estimate the significance of the difference between the means of the samples, based on multiple random re-sortings of the values that have been entered for samples A and B. As the page opens, you will be prompted for the sizes of the two samples. The Power of the Chi-Square "Goodness of Fit" Test, which pertains to the questionable common practice of accepting the null hypothesis upon failing to find a significant result in a one-dimensional chi-square test.