Question
Asked Nov 5, 2019
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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
0.040.04 with
9090​%
confidence if
​a) she uses a previous estimate of
0.420.42​?
​b) she does not use any prior​ estimates? 
 
 
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Expert Answer

Step 1

Given information:

Margin of error (E) = 0.04

Confidence level=90%

                                     =0.90

Step 2

So,

Significance level=1- Confidence level

=1-0.90

=0.10

Step 3

The value of Z-score in the normal distribution table in tw...

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