Thus 186 sample size arrived at should be corrected adjusted for finite population. To calculate the sample size for a clinical study we use statistical equations that employ inputs that mirror the population s study objective and design. N population size e Margin of error percentage in decimal form z z-score.
1 In some quantitative research stricter confidence levels are used eg.
Margin of error also referred to as confidence interval refers to the amount of error you wish to allow in. Using a target. Population size refers to the total number of people within your demographic. The importance of socio-demographics in online surveys.