If your supervisor decides that they want to be 95% confident in the results of a survey were the population proportion is 0.21 and within ±0.05, how large of a sample do you need to complete the study? Using the question above, if your supervisor changes her mind and now wants a margin of error equal to 0.03 at 95% confidence level, your sample size would be? I only need the second part please. I'm getting two different answers and need to double check if it's 618.50 or 708.1349

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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If your supervisor decides that they want to be 95% confident in the results of a survey were the population proportion is 0.21 and within ±0.05, how large of a sample do you need to complete the study?

Using the question above, if your supervisor changes her mind and now wants a margin of error equal to 0.03 at 95% confidence level, your sample size would be?

I only need the second part please. I'm getting two different answers and need to double check if it's 618.50 or 708.1349

 

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