Definition Pooled Variance is a method to estimate the common variance of two or more populations (the underlying assumption here is that the variance of these populations is the same) by using the sample variances from these populations. Formula Pooled
Variance and Standard Error of the Mean – Derivation
Prerequisite concepts Expectation is the probability-weighted mean of the sum of all the possible outcomes of an experiment. It is also known as the expected value, mathematical expectation, EV, average, mean value, mean, or first moment. It is denoted as