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Question

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.


 

Yes

No

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