Mathematics, 24.04.2020 20:40 javier1026
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 2 percentage points with 99% confidence if (a) he uses a previous estimate of 25%? (b) he does not use any prior estimates?
Answers: 3
, 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 
.
. So
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A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size...
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