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SAT, 14.12.2020 20:20 dahloli4442
26. In 2009 a survey of Internet usage found that 79 percent of adults age 18 years and older in the United States use
the Internet. A broadband company believes that the percent is greater now than it was in 2009 and will conduct
a survey. The company plans to construct a 98 percent confidence interval to estimate the current percent and
wants the margin of error to be no more than 2.5 percentage points. Assuming that at least 79 percent of adults
use the Internet, which of the following should be used to find the sample size (n) needed?
(A) 1.96
(0.5)
S 0.025
n
(0.5)(0.5)
(B) 1.96,
< 0.025
n
(0.5)(0.5)
(C) 2.33,
< 0.05
(D) 2.33,
(0.79) (0.21)
< 0.025
n
(0.79) (0.21)
(E) 2.33,
< 0.05
n
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