Question: a. A statistics practitioner took a random sample of 50 observations from a population with a standard deviation of 25 and computed the sample mean

a. A statistics practitioner took a random sample of 50 observations from a population with a standard deviation of 25 and computed the sample mean to be 100. Estimate the population mean with 90% confidence.

b. Repeat part (a) using a 95% confidence level.

c. Repeat part (a) using a 99% confidence level.

d. Describe the effect on the confidence interval estimate of increasing the confidence level.

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