Suppose data collected by observers at randomly selected intersections across the country revealed that in a sample of 80 drivers, 20 were using their cell phone.

a) Give a point estimate of p, the true driver cell phone use rate (that is, the true proportion of drivers who are using their cell phone while driving).

b) Compute a 99% confidence interval for p.

Answer rating: 100% (QA)

Griven 20 80 20 O 25 80 99... View the full answer