Question

Suppose data collected by observers at randomly selected intersections across the country revealed that in a sample of 200 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 90% confidence interval for p.c. Give a practical interpretation of the interval, part b.a. A point estimate for pis.b. The 90% confidence interval for pis ((.)).(Round to two decimal places as needed.)c. Interpret this intervalA. We are confident that 90% of the population use a cell phone while driving.B. We are confident that 90% of the population do not use a cell phone while driving.C. We are 90% confident that the true proportion of drivers using cell phones is inside this interval.D. There is a 90% percent chance that the true proportion of drivers who use cell phones is outside this interval,оо

Answer 1

Given

200 drivers

20 were using their cell phone

A

Point estimate - Finding an approximate value of some parameter—such as the mean (average)—of a population from random samples of the population.

`(20)/(200)=(1)/(10)=0.1`

B

At 90% confidence level

`\begin{gathered} \alpha=1-0.90 \\ \alpha=0.1 \\ \end{gathered}`