1. Construct a confidence interval of the population proportion at the given level of confidence. x=120, n=1100, 95% confidence

The lower bound of the confidence interval is_____(Round to three decimal places as needed.)

The upper bound of the confidence interval is______ (Round to three decimal places as needed.)

2.The mean finish time for a yearly amateur auto race was 186.32 minutes with a standard deviation of 0.302 minute. The winning car, driven by Mike,

finished in 185.91 minutes. The previous year's race had a mean finishing time of 112.1 with a standard deviation of 0.127 minute. The winning car that year, driven by Sally, finished in 111.77 minutes. Find their respective z-scores. Who had the more convincing victory?

Mike had a finish time with a z-score of______

Sally had a finish time with a z-score of______ (Round to two decimal places as needed.)

Which driver had a more convincing victory?

A. Mike a more convincing victory because of a higher z-score.

B. Sally had a more convincing victory because of a higher z-score.

C. Mike a more convincing victory because of a lower z-score.

D.Sally had a more convincing victory because of a lower z-score.