Determine The Sample Size Needed To Construct A 95 Confidence Interval. Confidence level Typical choices are 90 95 or 99. In order to construct a 95 confidence interval with a margin of error of 4 we should obtain a sample of at least n 601.
Population standard deviation σ 5 σ 5. In order to construct a 95 confidence interval with a margin of error of 4 we should obtain a sample of at least n 601. Heres a worked example assuming you chose a 95 confidence level 5 standard deviation and a margin of error confidence interval of - 5.
840 Determine the sample size needed to construct a 95 confidence interval to estimate the population mean for the following margins of error when.
The sample size is equal to 385. Thus for the case above a. The sample size needed is Round up to the nearest integer. This is the size one your variations needs to be.
