Running red lights. A random digit dialing telephone survey of 880 driversasked
Chapter 0, Problem 20.32(choose chapter or problem)
Running red lights. A random digit dialing telephone survey of 880 driversasked, Recalling the last ten traffic lights you drove through, how many of themwere red when you entered the intersections? Of the 880 respondents, 171admitted that at least one light had been red.19(a) Give a 95% confidence interval for the proportion of all drivers who ran oneor more of the last ten red lights they met.(b) Nonresponse is a practical problem for this surveyonly 21.6% of calls thatreached a live person were completed. Another practical problem is thatpeople may not give truthful answers. What is the likely direction of the bias: doyou think more or fewer than 171 of the 880 respondents really ran a red light?Why?
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