# 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.

**View Solution:**## Answer to relevant Questions

a. The sample mean and standard deviation from a random sample of 10 observations from a normal population were computed as x̄ = 23 and s = 9. Calculate the value of the test statistic of the test required to determine ...a. To test the following hypotheses, a statistics practitioner randomly sampled 100 observations and found x̄ = 106 and s = 35. Calculate the test statistic (and for Excel users, the p-value) of a test to determine whether ...a. A statistics practitioner randomly sampled 1,500 observations and found x̄ = 14 and s = 25. Test to determine whether there is enough evidence at the 5% significance level to infer that the population mean is less than ...OfficeMax, a chain that sells a wide variety of office equipment often features sales of products whose prices are reduced because of rebates. Some rebates are so large that the effective price becomes $0. The goal is to ...Do the data provide enough evidence to infer that the average American adult completed more than 12 years of education (EDUC)?Post your question