You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonablepreliminary estimation for the population proportion. You would like to be S0% confident that you estimate is within 5%of the true population proportion. How large of a sample size is required?Hint: TextbooVideo

Question
Asked Mar 21, 2019
You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable
preliminary estimation for the population proportion. You would like to be S0% confident that you estimate is within 5%
of the true population proportion. How large of a sample size is required?
Hint: Textboo
Video
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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be S0% confident that you estimate is within 5% of the true population proportion. How large of a sample size is required? Hint: Textboo Video

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check_circleExpert Solution
Step 1

The exact population proportion is not given here. Therefore the population proportion can be assumed p cap as 0.5.

The confidence level is 80%.

Therefore, the level of significance is 0.20.

The margin of error is given as 0.05.

Step 2

The margin of error is defined as,

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Step 3

α = 0.20.

(α/2) = 0.10.

The critical value can be found by the excel formula, =NORM.INV(0....

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