7.17 Random samples of size n were selected from populations with the means and variances given here. Find the mean and standard deviation of the sampling distribution of the sample mean in each case: -

a. n = 36, u 10,0 = 9

b. n 100, u 5,0 = 4

c. n = 8, p =120,0 = 1 7.18 Refer to Exercise 7.17.

a. If the sampled populations are normal, what is the sampling distribution of x for parts

a, b, and c?

b. According to the Central Limit Theorem, if the sampled populations are not normal, what can be said about the sampling distribution of x for parts

a, b, and c?