# Question

a. A statistics practitioner drew a random sample of 400 observations and found that x̄ = 700 and s = 100. Estimate the population mean with 90% confidence.

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

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

d. What is the effect on the confidence interval estimate of increasing the confidence level?

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

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

d. What is the effect on the confidence interval estimate of increasing the confidence level?

## Answer to relevant Questions

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