Running red lights A random digit dialing telephone survey

Chapter , Problem R8.7

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Running red lights A random digit dialing telephone survey of 880 drivers asked, Recalling the last ten traffic 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.35 (a) Construct and interpret a 95% confidence interval for the population proportion. (b) Nonresponse is a practical problem for this surveyonly 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 light? Why? Are these sources of bias included in the margin of error? s Construct and interpret a confidence interval for a population mean. s Understand that a confidence interval gives a range of plausible values for the parameter.

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