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. Download and install Skype for Business with Microsoft 365 At the Skype for Business sign in page, enter your Microsoft 365 user ID and password, and then. 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. The t-score is calculated using the formula: T-Score tells you how many standard deviations from the mean your result is.
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