SOLUTION: Need help understanding sample size determination and how to get the answer for this, dont assume I know anything cause I cant figure out the step by step solution to the problem s
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Question 977327: Need help understanding sample size determination and how to get the answer for this, dont assume I know anything cause I cant figure out the step by step solution to the problem so please tell me how you get each part of the solution. I know that 95% zscore is 1.96 but I get lost with what to do with this question. Thanks for your help.
Find the sample size required to estimate the percent of voters who will vote "yes" on the upcoming town budget. Assume you want a 95% confidence interval and that the population from the sample is within 8 percentage points of the true population proportion. Answer by solver91311(24713) (Show Source):
The formula for sample size for estimating proportions is:
where is the preliminary estimate of the actual proportion. If you don't have a preliminary estimate of the proportion, use , which is to say . is your critical value, 1.96 in this case. And is your maximum allowable error, which you want to be 0.08.
Just plug in the numbers and do the arithmetic. Always round UP to the nearest whole number.
John
My calculator said it, I believe it, that settles it
