10.11. a. A random sample of 25 was drawn from a normal distribution whose standard deviation is 5 ...

Problem 2
Chapter 10 (Introduction to Estimation): Exercises 10.11
10.11. a. A random sample of 25 was drawn from a normal distribution whose standard deviation is 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean.
b. Repeat Part a with a sample size of 100.
c. Repeat Part a with a sample size of 400.
d. Describe what happens to the confidence interval estimate when the sample size increases.