An April 2009 survey of 2253 American adults conductedby the Pew Research Centers
Chapter 7, Problem 51(choose chapter or problem)
An April 2009 survey of 2253 American adults conductedby the Pew Research Centers Internet & American LifeProject revealed that 1262 of the respondents had at somepoint used wireless means for online access.a. Calculate and interpret a 95% CI for the proportion of allAmerican adults who at the time of the survey had usedwireless means for online access.b. What sample size is required if the desired width of the95% CI is to be at most .04, irrespective of the sampleresults?c. Does the upper limit of the interval in (a) specify a 95%upper confidence bound for the proportion being estimated?Explain.
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