1.Construct a confidence interval for p1p2 at the given level of confidence.

x1=34, n1=261, x2=31, n2=325, 99% confidence

The researchers are ____% confident the difference between the two populationproportions, p1p2, is between _____and _____

.Use ascending order. Type an integer or decimal rounded to three decimal places asneeded.)

2.The mean finish time for a yearly amateur auto race was 185.94 minutes with a standard deviation of 0.375 minute. The winningcar, driven by Perry, finished in 185.36 minutes. The previousyear's race had a mean finishing time of 111.1 with a standard deviation of 0.141 minute. The winning car thatyear, driven by Karen, finished in 110.81 minutes. Find their respectivez-scores. Who had the more convincingvictory?

Perry had a finish time with az-score of _____

Karen had a finish time with az-score of _____

(Round to two decimal places asneeded.)

Which driver had a more convincingvictory?

A.

Perry a more convincing victory because of a lowerz-score.

B.

Karen had a more convincing victory because of a higherz-score.

C.

Perry a more convincing victory because of a higherz-score.

D.

Karen had a more convincing victory because of a lowerz-score.

3.Assume that both populations are normally distributed.

(a) Test whether 12 at the =0.05 level of significance for the given sample data.

(b) Construct a 95% confidence interval about 12.

Population 1 Population 2 18 18 16.6 19.3 4.1 4.3DA OB A OA