According to a 2008 survey by the Pew Research Center, two out of three American

Question

According to a 2008 survey by the Pew Research Center, two out of three Americans aged between 18 and 29 years use social networking web sites such as MySpace and Facebook. Interestingly, 27% of the two hundred and twenty- five 18-29 years olds surveyed say that they have received information about the 2008 presidential political candidates from social networking Web sites. The 95% confidence interval for the percentage of Americans aged between 18 and 29 years that use social networking Web sites to obtain information about political candidates is between the lower limit of the interval of _____ % and the upper limit of the interval of _____ %. Please round to the nearest whole number.

Explanation / Answer

Here Sample Proportion = 0.27 and Sample size = 225

Margin of error = 1.960*Sqrt(0.27*0.73/225) = 0.05801

95% Interval is

(0.27-0.05801, 0.27+0.05801)

(21%, 33%)

So, First option is 21% and Second Option is 33%

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