# Question: A A sample of 100 observations taken from a population

a. A sample of 100 observations taken from a population produced a sample mean equal to 55.32 and a standard deviation equal to 8.4. Make a 90% confidence interval for µ

b. Another sample of 100 observations taken from the same population produced a sample mean equal to 57.40 and a standard deviation equal to 7.5. Make a 90% confidence interval for µ

c. A third sample of 100 observations taken from the same population produced a sample mean equal to 56.25 and a standard deviation equal to 7.9. Make a 90% confidence interval for µ

d. The true population mean for this population is 55.80. Which of the confidence intervals constructed in parts a through c cover this population means and which do not?

b. Another sample of 100 observations taken from the same population produced a sample mean equal to 57.40 and a standard deviation equal to 7.5. Make a 90% confidence interval for µ

c. A third sample of 100 observations taken from the same population produced a sample mean equal to 56.25 and a standard deviation equal to 7.9. Make a 90% confidence interval for µ

d. The true population mean for this population is 55.80. Which of the confidence intervals constructed in parts a through c cover this population means and which do not?

## Answer to relevant Questions

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 high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 2000 seniors who pay for their medicines showed that they ...A dentist wants to find the average time taken by one of her hygienists to take X-rays and clean teeth for patients. She recorded the time to serve 24 randomly selected patients by this hygienist. The data (in minutes) are ...Check if the sample size is large enough to use the normal distribution to make a confidence interval for p for each of the following cases. a. n = 80 and p̂ = .85 b. n = 110 and p̂ = .98 c. n = 35 and p̂ = .40 d. n = 200 ...Briefly explain how the width of a confidence interval decreases with a decrease in the confidence level. Give an example.Post your question