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In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly.

Of the Internet users, 1054 use a social networking site.1Find a 90%

confidence interval for each of the following proportions.

(a) Proportion of US adults who use the Internet regularly.

The 90% confidence interval is ____to ___

(b) Proportion of US adult Internet users who use a social networking site.

The 90 confidence interval is ___ to ____

(c) Proportion of all US adults who use a social networking site.

The 90% confidence interval is ____ to ____

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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