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Suppose data collected by observers at randomly selected intersections across the country revealed that in a sample of 50 drivers, 30 were using their cell phone. a. Give a point estimate of 1:, the true driver cell phone use rate (that is, the true proportion- or- population porportion of drivers who are using their cell phone while driving). b. Compute a 90% condence interval for it. c. Give a practical interpretation of the interval, part b. a. A point estimate for It is b. The 90% condence interval for the population proportion 7: is ( , ). (Round to two decimal places as needed.) c. Interpret this interval. 0 A. There is a 90% percent chance that the population proportion of drivers who use cell phones is outside this interval. 0 B. We are 90% condent that the population proportion of drivers using cell phones is inside this interval. 0 C. We are condent that 90% of the population use a cell phone while driving. 0 D. We are condent that 90% of the population do not use a cell phone while driving