# Question: A A sample of 400 observations taken from a population

a. A sample of 400 observations taken from a population produced a sample mean equal to 92.45 and a standard deviation equal to 12.20. Make a 98% confidence interval for µ

b. Another sample of 400 observations taken from the same population produced a sample mean equal to 91.75 and a standard deviation equal to 14.50. Make a 98% confidence interval for µ

c. A third sample of 400 observations taken from the same population produced a sample mean equal to 89.63 and a standard deviation equal to 13.40. Make a 98% confidence interval for µ

d. The true population mean for this population is 90.65. Which of the confidence intervals constructed in parts a through c cover this population means and which do not?

b. Another sample of 400 observations taken from the same population produced a sample mean equal to 91.75 and a standard deviation equal to 14.50. Make a 98% confidence interval for µ

c. A third sample of 400 observations taken from the same population produced a sample mean equal to 89.63 and a standard deviation equal to 13.40. Make a 98% confidence interval for µ

d. The true population mean for this population is 90.65. Which of the confidence intervals constructed in parts a through c cover this population means and which do not?

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

A random sample of 16 airline passengers at the Bay City airport showed that the mean time spent waiting in line to check in at the ticket counters was 31 minutes with a standard deviation of 7 minutes. Construct a 99% ...Jack’s Auto Insurance Company customers sometimes have to wait a long time to speak to a customer service representative when they call regarding disputed claims. A random sample of 25 such calls yielded a mean waiting ...A businesswoman is considering whether to open a coffee shop in a local shopping center. Before making this decision, she wants to know how much money people spend per week at coffee shops in that area. She took a random ...a. A sample of 300 observations taken from a population produced a sample proportion of .63. Make a 95% confidence interval for p. b. Another sample of 300 observations taken from the same population produced a sample ...Determine the most conservative sample size for the estimation of the population proportion for the following. a. E = .025, confidence level = 95% b. E = .05, confidence level = 90% c. E = .015, confidence level = 99%Post your question