# Question: Assume simple random sampling Calculate the 95 confidence interval estimate

Assume simple random sampling. Calculate the 95% confidence interval estimate for the population mean for each of the following.

a. N = 1200; n = 80; s = 10; x = 142

b. N = 1425; n = 90; s2 = 64; x = 232.4

c. N = 3200; n = 200; s2 = 129; x = 59.3

a. N = 1200; n = 80; s = 10; x = 142

b. N = 1425; n = 90; s2 = 64; x = 232.4

c. N = 3200; n = 200; s2 = 129; x = 59.3

## Answer to relevant Questions

Assume simple random sampling. Calculate the confidence interval for the population total for each of the following. a. N = 1325; n = 121; s = 20; x = 182; 95% confidence level b. N = 2100; n = 144; s = 50; x = 1,325; 98% ...On a particular day a consumer-advice bureau received 125 calls. For a random sample of 40 of these calls, it was found that mean time taken in providing the requested advice was 7.28 minutes, and the sample standard ...A class has 420 students. The final examination is optional-taking it can raise, but cannot lower, a student's grade. Of a random sample of 80 students, 31 indicated that they would take the final examination. Find a 90% ...Determine the sample size needed for each of the following situations. a. N = 1,650 σ = 500 1.96σx-bar = 50 b. N = 1,650 σ = 500 1.96σx-bar = 100 c. N = 1,650 σ = 500 1.96σx-bar = 200 d. Compare and comment on your ...Find the reliability factor, zα/2, to estimate the mean, μ, of a normally distributed population with known population variance for the following. a. 93% confidence level b. 96% confidence level c. 80% confidence levelPost your question