![]() If the population standard deviation is available and the sample size is greater than 30, t-distribution can be used with the population standard deviation instead of the sample standard deviation. Summary: If the sample sizes are larger than 30, the z-distribution and the t-distributions are pretty much the same and either one can be used. ![]() All the items from distributions with different means and/or different standard deviations. The t-score is calculated using the formula: Z Score Calculator to compare the relative standings of items. ![]() T-Score tells you how many standard deviations from the mean your result is.
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