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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