Statistics Help: Determining n?

Posted on 2016-03-16 18:43:00 in Statistics by NINDA

19) what sample size should a researcher take if he wants to estimate a population proportion to be within 2 percent of the true value with 90 percent confidence? 

20)What sample size should a researcher take if he wants to estimate a population proportion to be within 3 percent of the true value with 95 percent confidence? Previous research suggests the proportion is equal to 25 percent. 

21) To estimate the proportion of teen traffic deaths in Texas last year that was caused by speeding, determine the necessary sample size for the estimate to be accurate to within .05 with probability .99. 
a) suppose from a previous study, we expect the proportion to be about .30. 
b) Suppose we do not have any prior knowledge about the true proportion.

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