Which best describes (x - xbar)^2: positive, non-positive, negative, or non-negative? Given that, is it even possible for the sum to equal zero? If so, under what conditions? How does that relate to whether the variance is zero?In the formula for the variance of values in a sample, Σ (x – xbar)^2/n-1, what is required for the variance to equal zero?
In the formula for the variance of values in a sample, Σ (x – xbar)^2/(n-1), . . .