# Refer to the accompanying data display that results

• 10

This preview shows page 7 - 9 out of 10 pages.

Question 14Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. The results in the screen display are based on a95%confidence level. Write a statement that correctly interprets the confidence interval.´x=17.598Sx=16.01712719n=50Choose the correct answer below. A.We have95%confidence that the limits of 13.05 Mbps and 22.15 Mbps contain the true value of the mean of the population of all data speeds at the airports.B.The limits of 13.05 Mbps and 22.15 Mbps contain 95% of all of the data speeds at the airports.C.The limits of 13.05 Mbps and 22.15 Mbps contain the true value of the mean of the population of all data speeds at the airports.D.We have 95% confidence that the limits of 13.05 Mbps and 22.15 Mbps contain the sample mean of the data speeds at the airports. Question 15What does it mean to say that the confidence interval methods for the mean are robust against departures from normality?Choose the correct answer below.
Question 16Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value tα/2, (b) find the critical value zα/2or (c) state that neither the normal distribution nor the t distribution applies.The confidence level is 99%, σ=4100thousand dollars, and the histogram of 64 player salaries (in thousands of dollars) of football players on a team is as shown.Select the correct choice below and, if necessary, fill in the answer box to complete your choice.(Round to two decimal places as needed.)
• • • 