1. Givens:

x = 200

n = 1,000

= 20

Calculate the following:

a) standard error of the sampling distribution of sample mean.

b) margin of error for a 90% confidence interval estimate of the population mean.

2. Givens:

n = 8

= 1.6

= 32 inch

Calculate the probability that in this random sample the x is more than 31 inch.