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a researcher wishes to estimate the percentage of adults who support abolishing the penny. What size...

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 90​% confidence if ​

(a) he uses a previous estimate of 25 ​%?

​(b) he does not use any prior​ estimates?

Math   Statistics-And-Probability   
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