# Question

a. The mean and standard deviation of a sample of 100 is x̄ = 1500 and s = 300. Estimate the population mean with 95% confidence.

b. Repeat part (a) with s = 200.

c. Repeat part (a) with s = 100.

d. Discuss the effect on the confidence interval estimate of decreasing the standard deviation s.

b. Repeat part (a) with s = 200.

c. Repeat part (a) with s = 100.

d. Discuss the effect on the confidence interval estimate of decreasing the standard deviation s.

## Answer to relevant Questions

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) ...a. A statistics practitioner is in the process of testing to determine whether there is enough evidence to infer that the population mean is different from 180. She calculated the mean and standard deviation of a sample of ...a. After sampling 1,000 members of a normal population, you find x̄ = 15,500 and s = 9,950. Estimate the population mean with 90% confidence.b. Repeat part (a) assuming that you know that the population standard deviation ...A federal agency responsible for enforcing laws governing weights and measures routinely inspects packages to determine whether the weight of the contents is at least as great as that advertised on the package. A random ...On a per capita basis, the United States spends far core on health than any other country. To help assess the costs, annual surveys are undertaken. One such survey asks a sample of Americans to report the number of times ...Post your question

0