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Use ZInterval when you have a single variable to analyze, and you already know the standard deviation
Because the average deviation will always be zero.
T-score is used when you don't have the population standard deviation and must use the sample standard deviation as a substitute.
Standard deviation is a measure of how spread out a set of numbers are from each other. It has a variety of uses in statistics.
The goal is to disregard the influence of sample size. When calculating Cohen's d, we use the standard deviation in teh denominator, not the standard error.