Cochran's sample size formula

Cochran's sample size formula helps determine how many people you need to survey to get reliable results on a population's characteristics, like opinions or behaviors. It considers the desired level of confidence (how sure you want to be), the acceptable margin of error (how close the results should be to the true population value), the variability in the population (how diverse opinions or traits are), and the proportion of the population with a specific attribute. This ensures the sample is large enough to accurately reflect the whole population while avoiding unnecessary effort and cost.