Since the t-interval is often associated with interval estimates based on small samples,it is not appropriate for large samples.

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Quizplus · Accepted Answer

The t-interval can also be used for interval estimates based on large samples, but its use becomes less necessary as the sample size increases and the standard error of the mean approaches the population standard deviation. In these cases, a z-interval can be used instead.

Since the T-Interval Is Often Associated with Interval Estimates Based