Answer Happy

For a data set obtained from a sample, n=77 and xˉ=46.05. It is known that σ=4.1. a. What is the point estimate of μ ? The point estimate is b. Make a 97% confidence interval for μ. Round your answers to two decimal places. c. What is the margin of error of estimate for part b? Round your answer to three decimal places. E=
The standard deviation for a population is σ=15.8. A sample of 19 observations selected from this population gave a mean equal to 137.05. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 99% confidence interval for μ. b. Construct a 97% confidence interval for μ. c. Determine a 95% confidence interval for μ. d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?