Find Required Sample Size. Errors are inevitable the question is how much error youll allow. You can do this by using a formula or by finding a sample size calculator online.
Each of the shaded tails in the following figure has an area of 0025. Sigma σ is provided and the significance level is specified we can compute the minimum required sample size that will lead to a margin of error less than or equal to the one specified by using the following formula. Our calculator shows you the amount of respondents you need to get statistically significant results for a specific population.
The region to the left of and to the right of 0 is 05 0025 or 0475.
When determining the sample size needed for a given level of accuracy you must use the worst case percentage 50. Button to generate the results. You can do this by using a formula or by finding a sample size calculator online. A 95 degree confidence corresponds to 005.
