Question

If a sample size is less than​ ________, the sample size must come from a population having a normal distribution in order to follow normal distribution calculations.

Answer 1

My guess is 30 for the sample size.

Answer 2

If a sample size is less than​ ___30_____, the sample size must come from a population having a normal distribution in order to follow normal distribution calculations.

Explanation:

By Central Limit Theorem we know that if we have a population with mean μ and standard deviation σ, also for sufficiently large sample size, sample distribution is approximately Normally distributed i.e. the population is normal then this theorem is true even for sample size less than 30.