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1 Running red survey of 880 drivers asked Recalling the last 10 traf fic lights...

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1 Running red survey of 880 drivers asked Recalling the last 10 traf fic lights you drove through how many of them were red when you entered the intersections Of the 880 respondents 171 admitted that at least one light had been red 24 a Give a 95 confidence interval for the proportion of all drivers who ran one or more of the last 10 red lights they met b Nonresponse is a practical problem for this survey only 21 6 of calls that reached a live person were completed Another practical problem is that people may not give truthful answers What is the likely direction of the bias do you think more or fewer than 171 of the 880 respondents really ran a red

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