Margin of error. Confidence level
Asked Mar 29, 2009, 02:29 PM
1.Use margin of error, confidence level, and standard deviation to find the minimum sample size required to estimate an unknown population mean.
Margin of error: $124, Confidence level; 99%, σ = $560
2.Find the margin of error for 95% confidence interval used to estimate the population propprtion.
In a clinical test with 2333 subjects, 50% showed improvement from the treament.
Thank, I'm having a hard time figure how to get the answers here.