The formula for the sample size can be written mathematically as follows. Then we pick a choice or response 5005 and the confidence interval 005 5 using the formula below. N Population size Z Critical value of the normal distribution at the required confidence level p Sample proportion e Margin of error.
Z is the z score.
Sample Size Formula for Infinite and Finite Population SS Sample size Z Given Z value p Percentage of population C Confidence level Pop Population. The ever increasing need for a representative statistical sample in empirical research has created the demand for an effective method of determining sample size. It all depends on the specific project en the method you are using. If your population is smaller and known just use the sample size calculator.