Mathematics, 15.04.2020 17:46 Basicwhitegirl1
A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie. Among the 500 respondents, 12% chose chocolate pie, and the margin of error was given as plus or minus3 percentage points. Given specific sample data, which confidence interval is wider: the 95% confidence interval or the 80% confidence interval? Why is it wider?
Answers: 1
, and a confidence level of 
, we have the following confidence interval of proportions.
.
, z is the value of Z that has a pvalue of 
, so 
.
, z is the value of Z that has a pvalue of 
, so 
.
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A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie....
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