Refer to the previous exercise. Describe the relationship between margin of error and sample size.

Data from previous Exercise

For each of the confidence intervals in the previous exercise, calculate and interpret the margin of error.

Data from previous exercise

The duration customer service calls to an insurance company is normally distributed, with mean 20 minutes, and standard deviation 5 minutes. For the following sample sizes, construct a 95% confidence interval for the population mean duration of customer service calls.

a. n = 25

b. n = 100

c. n = 400