1. You want to obtain a sample to estimate a population proportion. At this point in...

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1. You want to obtain a sample to estimate apopulation proportion. At this point in time, you have noreasonable preliminary estimation for the population proportion.You would like to be 95% confident that you estimate is within 3%of the true population proportion. How large of a sample size isrequired?
2. A political candidate has asked you toconduct a poll to determine what percentage of people support her.If the candidate only wants a 8% margin of error at a 90%confidence level, what size of sample is needed
3. You want to obtain a sample to estimate apopulation mean. Based on previous evidence, you believe thepopulation standard deviation is approximately ?=45.1?=45.1. Youwould like to be 98% confident that your estimate is within 4 ofthe true population mean. How large of a sample size isrequired?
4. You want to obtain a sample to estimate howmuch parents spend on their kids birthday parties. Based onprevious study, you believe the population standard deviation isapproximately ?=51.3?=51.3 dollars. You would like to be 95%confident that your estimate is within 1.5 dollar(s) of averagespending on the birthday parties. How many parents do you have tosample?

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3.9 Ratings (759 Votes)

1 Let population proportion p 05 Margin of error E 3 003 Confidence Level CL 095 Significance level 1 CL 005 Critical value z NORMSINV0052 196 Sample See Answer

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