How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10? Assume that the population standard deviation is 20.
Given that, population standard deviation =
20
margin of error ( E ) = 10
confidence level = 95%
A 95% confidence level has significance level = 0.05
and critical value is,
We want to find the sample size ( n ),
Required sample size is 15
Note: if you want sample size is nearest to next integer then it is equal to 16
How large a sample should be selected to provide a 95% confidence interval with a margin...
How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10? Assume that the population standard deviation is 20. Round your answer to next whole number.
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