n1 is the sample size of sample 1. x2 is the mean of sample 2. s2 is the standard deviation of sample 2.

What does x1 mean in statistics?

• xi represents the ith value of variable X. For the data, x1 = 21, x2 = 42, and so on. • The symbol Σ (“capital sigma”) denotes the summation function.

What is the value of n in statistics?

The symbol ‘N’ represents the total number of individuals or cases in the population.

The reason we use n-1 rather than n is so that the sample variance will be what is called an unbiased estimator of the population variance ��2. Note that the concepts of estimate and estimator are related but not the same: a particular value (calculated from a particular sample) of the estimator is an estimate.