# Question: a The sample mean and standard deviation from a sample

a. The sample mean and standard deviation from a sample of 81 observations are x̄ = 63 and s = 8. Estimate e with 95% confidence.

b. Repeat part (a) with n = 64.

c. Repeat part (a) with n = 36.

d. Describe what happens to the confidence interval Estimate when the sample size decreases.

b. Repeat part (a) with n = 64.

c. Repeat part (a) with n = 36.

d. Describe what happens to the confidence interval Estimate when the sample size decreases.

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