Repeat Exercise 20 for samples of size 18 and 12.

What happens to the mean and the standard deviation of the distribution of sample means as the sample size decreases?

Data from Exercises 20

The scores for females on the critical reading portion of the SAT in 2016 are normally distributed, with a mean of 493 and a standard deviation of 114. Random samples of size 36 are drawn from this population, and the mean of each sample is determined.