Mathematics, 01.11.2019 03:31 Person51761
Na poll to estimate presidential popularity, each person in a random sample of 1,000 voters was asked to agree with one of the following statements: the president is doing a good job. the president is doing a poor job. i have no opinion. a total of 560 respondents selected the first statement, indicating they thought the president was doing a good job. (a) construct a 95 percent confidence interval for the portion of respondents who feel the president is doing a good job.
(b) based on your interval in part, is it reasonable to conclude that a majority (half) of the population believes the president is doing a good job?
Answers: 3
, and a confidence interval 
, we have the following confidence interval of proportions.
.
and 
.
, z is the value of Z that has a pvalue of 
= 0.975, so 
.
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Na poll to estimate presidential popularity, each person in a random sample of 1,000 voters was aske...
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