Out of 1,068 fourth down situations in the National Football League (NFL), 959 times a team punted when, statistically speaking, they should have gone for the first down. Estimate at 99% confidence the percent of the time teams should go for the first down in all such situations. 10. Find the correct z-score or t-score. Sketch the appropriate bell curve. 11. Calculate the standard error. 12. Calculate the margin of error. 13. Calculate the interval. 14. Interpret your results in the context of the problem.

calculate the Sd.

Twenty-five people, consisting of a statistics professor and her​ students, are to measure the length of a room to the nearest tenth of a millimeter. Assume that everyone uses the same​ well-calibrated measuring​ device, such as a tape measure. Complete parts a through d below.       a. All 25 measurements are not likely to be exactly the​ same; thus, the measurements will contain some sources of error. Are these errors systematic or​ random? Explain.     A. These errors are systematic. If they were​ random, it would be undeterminable whether the measurements are all too high or too low.   B. These errors are random. If they were​ systematic, there would be a tendency for the measurements to be all too high or all too low.   C. These errors are​ random, because there is a tendency for the measurements to be all too high or too low.   D. These errors are​ systematic, because it is undeterminable whether the measurements are too high or too low. b. If the…

There are 435 seats in a​ nation's House of Representatives. The number of representatives per state is calculated using a statistical formula determined by​ law, but allocation is roughly proportionate to population. In​ 2010, the​ nation's population was estimated to be 309.1 million. The​ state's population was estimated at 26.1 million. How many representatives would you expect to be assigned to the​ state? Suppose the state actually has 34 representatives. Compare this with the expected number of representatives from the state.