One can calculate the 95% confidence interval for the mean with the population standard deviation known. This will give us an upper and a lower confidence limit. What happens if we decide to calculate the 99% confidence interval? Describe how the increase in the confidence level has changed the width of the confidence interval. Do the same for the confidence interval set at 80%. Include an example with actual numerical values for the intervals in your post to help with your explanations.

Answer The width of the confidence interval increases with an increase in confidence level. confidence interval is higher in 99% than in 95% and much lower in 80%. for example, we sample 20 new cars and find the average miles per gallon to be 26 with a standard deviation of 1.7, confidence interval...