Question

Which of these is NOT one of the advantages of increasing sample size? it may decrease...

Which of these is NOT one of the advantages of increasing sample size?

it may decrease margin of error

it may increase Confidence Level

it may increase precision

it may decrease the width of Confidence Interval

Math   Statistics-And-Probability   
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Answer #1

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1. If you increase the sample size, you will increase the precision of your estimates

2. Also, if you increase the sample size, margin of error will decrease.

Margin of Error = Z*Stdev/sqrt(N), where N = sample size. So, if N increases Margin of Error decreases.

3. If margin of error decreases, so does the width of confidence interval . This is because confidence interval is defined as :

Mean +/- Margin of error(E). If E decreases so does this width.

4. It has no effect on Confidence interval

Answer: Correct answer is : It may decreases Confidence interval

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