D Question 27 0.09 pts A highway engineer wishes to study highway speeds. Listed below is a simple random sample of speeds (mph) obtained at 4:48 PM on a weekday on the south 405 at Wilshire Blud: 32 31 31 27 31 24 29 28 29 39 30 37 22 25 Use the critical value method and a 5% significance level to test the claim that the standard deviation of the speeds is equal to 5.0 mph. Calculate the sample standard deviation (round to the nearest ten-thousandth). D Question 28 0.09 pts A highway engineer wishes to study highway speeds. Listed below is a simple random sample of speeds (mph) obtained at 4:48 PM on a weekday on the south 405 at Wilshire Blvd: 32 31 31 27 31 24 29 28 29 39 30 37 22 25 Use the critical value method and a 5%% significance level to test the claim that the standard deviation of the speeds is equal to 5.0 mph. What is the claim? (At this point, you should have already selected the formula that will be used to calculate the test statistic and written it in the test statistic box ) O a s 5.0 Oo- 50 O a: 5.0 0 0 . 50 O o> 5.0 0 0 * 50