A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 90% confidence if (a) she uses a previous estimate of 0.46? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 90% confidence if (a) she uses a previous estimate of 0.46? (b) she does not use any prior estimates?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within
0.02
with
90%
confidence if(a) she uses a previous estimate of
0.46?
(b) she does not use any prior estimates?
Expert Solution
Step 1
The question is about sample size estimation
Given :
Estimate is within 0.02
That means,
Margin of error ( E ) = 0.02
Confidence level = 0.90
To find :
a ) Sample size when previous estimate is 0.46
b ) Sample size when previous estimate is not used
Step by step
Solved in 2 steps with 1 images
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