Finding Sample Size. You can also find the level of precision you have in an existing sample. This Sample Size Calculator is presented as a public service of Creative Research Systems survey software.
So you need to take a random sample of at least 211 college students in order to have a margin of error in the number of. N population size e Margin of error percentage in decimal form z z-score. You can calculate the sample size in five simple steps.
In our example our sample size is.
So you need to take a random sample of at least 211 college students in order to have a margin of error in the number of. So for your email send if you have one control and one variation youll need to double this number. This is the size one your variations needs to be. This Sample Size Calculator is presented as a public service of Creative Research Systems survey software.
