The central limit theorem is important in statistics because select one: a. for a large n, it says the sampling distribution of the sample mean is approximately normal, regardless of the shape of the population. b. for a large n, it says the population is approximately normal. c. for any sized sample, it says the sampling distribution of the sample mean is approximately normal d. for any population, it says the sampling distribution of the sample mean is approximately normal, regardless of the sample size.