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What is T Distribution and Z distribution in everyday work place?

What is T Distribution and Z distribution in everyday work place?

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The t distribution (aka, Student’s t-distribution) is a probability distribution that is used to estimate population parameters when the sample size is small and/or when the population variance is unknown.

A probability density function and especially a normal distribution that has a mean equal to zero and a standard deviation equal to one and that is used especially in testing hypotheses about means or proportions of samples drawn from populations whose population standard deviations are known.

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