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Suppose data collected by observers at randomly selected intersections across the country revealed that in a...

Suppose data collected by observers at randomly selected intersections across the country revealed that in a sample of 40 ​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.

Math   Statistics-And-Probability   
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