how can you find your covariance using a stat what is x y z what is the y-x formula in statistics what is the covariance of x does cov mean x how to find the difference between y,y and y does y represent variable variance what can you know about the variance when do you know how to solve for variance when the variance is found with y, does this statistic have to be calculated? does x y y? can you solve variance and covariance if x is y and you know var(y), var(z), and cov(y,z), do you know cov(x,z? when the y is cov, can I solve for y if the variance in a statistic is y, can I solve for the covariance with other variables? what is the x and y in statistics can you solve the variance and covariance of x? can you solve the variance of y when you know what a variable has a covariance what can you do if x = y*y?