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StatisticsQ&A LibraryA 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 within0.040.04 with9090%confidence ifa) she uses a previous estimate of0.420.42?b) she does not use any prior estimates?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 ifa) she uses a previous estimate of

0.420.42?

b) she does not use any prior estimates?

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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