(Answered) A a random sample of 25 was drawn from a normal

Statistics

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 b with a sample size of 400.

d. Describe what happens to the confidence interval estimate when the sample sizes increases.

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