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In a survey of 2255 randomly selected US adults (age 18 or older)

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.1 Find a 90%

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confidence interval for each of the following proportions.

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

Round your answers to three decimal places.

The 90%

 confidence interval is 

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

Round your answers to three decimal places.

The 90%

 confidence interval is

(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 

.

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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