Asked Nov 5, 2019
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
confidence if
​a) she uses a previous estimate of
​b) she does not use any prior​ estimates? 

Expert Answer

Step 1

Given information:

Margin of error (E) = 0.04

Confidence level=90%


Step 2


Significance level=1- Confidence level



Step 3

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

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