Estimate Sample Size Needed. N N 1 4 N 1 d 2 z α 2 2 1 4. For estimating population mean the equation becomes.
5 5 n 196 2 n 38416. For estimating population mean the equation becomes. Now if we specify 1 α the margin of error d also can be viewed as the half width of the 1 α 100 CI we can solve for the sample size such that the CI has the specified margin of error.
Since p 1 - p attains maximum at p 12 a conservative estimate for sample size is.
More about the minimum sample size required to estimate the population mean so you can better interpret the results obtained by this solver. For estimating population mean the equation becomes. Since you havent yet run your survey a safe choice is a standard deviation of 5 which will help make sure your sample size is large enough. Dummies helps everyone be more knowledgeable and confident in applying what they know.
