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(c) Proportion of all US adults who use a social networking site. Round your answers to three decimal places. The 90% confidence interval is to

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(c) Proportion of all US adults who use a social networking site. Round your answers to three decimal places. The 90% confidence interval is to i Use the confidence interval to estimate whether it is plausible to estimate that 50 % of all US adults now use a social networking site

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