Question: In constructing the interval estimate, the small sample approach is used when the sample size is at most 30 while the large sample approach is

In constructing the interval estimate, the small sample approach is used when the sample size is at most 30 while the large sample approach is used when the sample size is more than 30. Why do the size of 30 used as the border to differentiate between the small sample approach and large sample approach?

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