The Pew Research Center Internet Project, conducted on the 25th anniversary of the Internet, involved a survey of 857 Internet users (Pew Research Center website, April 1, 2014). It provided a variety of statistics on Internet users. For instance, in 2014, 87% of American adults were Internet users. In 1995 only 14% of American adults used the Internet.
a. The sample survey showed that 90% of respondents said the Internet has been a good thing for them personally. Develop a 95% confidence interval for the proportion of respondents who say the Internet has been a good thing for them personally (to 4 decimals).
95% Confidence Interval: ___ to ___.
I know that the formula is TS: z = p bar - p / sqrt p(-p)/n
n = 857
I don't know how to solve for p bar and p.
1 answer
0.8976 to 0.9024
1 answer