Question
Asked Oct 6, 2019
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Aresearcher 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 3 percentage
points with 95% confidence if
(a) he uses a previous estimate of 22%
(b) he does not use any prior estimates?
(Round up to the nearest integer.)
(a) n
(b) n
Round up to the nearest integer.)
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Aresearcher 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 3 percentage points with 95% confidence if (a) he uses a previous estimate of 22% (b) he does not use any prior estimates? (Round up to the nearest integer.) (a) n (b) n Round up to the nearest integer.)

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Expert Answer

Step 1

It is given that margin of error (E) is 0.03 and the confidence level is 95%.

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Here a 1-0.95 =0.05 0.05 2 0.025 Za Z0.025 -1.96(Using standard normal table

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Step 2

a.

The sample size n is obtained using previous estimate o...

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p(1-p) E 1.96 0.03 (0.22)(1-0.22) 733

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Hypothesis Testing

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