The $t$-distribution must be used when the sample size is greater than 30 and the variable is normally or approximately normally distributed.

Name: The $t$-distribution must be used when the sample size is greater than 30 and the variable is normally or approximately normally distributed.
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The $t$-distribution is typically used when the sample size is small (usually less than 30) and the population standard deviation is unknown. For larger sample sizes, the normal distribution is often used instead.

The ttt -Distribution Must Be Used When the Sample Size Is Greater

The $t$ -Distribution Must Be Used When the Sample Size Is Greater