Cell phone use by drivers. Refer to the U.S. Department of Transportation study of the level of cell phone use by drivers while they are in the act of driving a motor passenger vehicle, presented in Exercise. Recall that in a random sample of 1,165 drivers selected across the country, 35 were found using their cell phone.
a. Conduct a test (at α =.05 ) to determine whether p , the true driver cell phone use rate, differs from.02.
b. Does the conclusion, you drew in part a agree with the inference you derived from the 95% confidence interval for p in Exercise 5.119? Explain why or why not.
Cell phone use by drivers. The U.S. Department of Transportation reported the results of the National Occupant Protection Use Survey . One focus of the survey was to determine the level of cell phone use by drivers while they are in the act of driving a motor passenger vehicle. Data collected by observers at randomly selected intersections across the country revealed that in a sample of 1,165 drivers, 35 were using their cell phone.
a. Give a point estimate of p , the true driver cell phone use rate (i.e., the true proportion of drivers who are using a cell phone while driving).
b. Compute a 95% confidence interval for p .
c. Give a practical interpretation of the interval you found in part b .
d. How many drivers need to be sampled to estimate the true cell phone use rate to within .005 with 95% confidence?
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