test for mean and variance which test is used to determine if a variable is linear or heteroskedastic if x_i$ is independent of sigma_i$, how to test for both variance and mean? what test to use if mean/vagance vary can a linear test be performed for a variable in a simple linear regression if mean and variance vary linearly, which test is performed? when is x i$ independent of x i$ a regression test how is mean and variance tested how to check for a variable and test when is a measure of mean and variance independent what is meant by the term mean and variance how to test for a variance in a regression what is the difference in mean and variance how to test for mean and variance for a variable which is an example of a test which is independent of the value of variable x-i$? how to test for a variance when a variable variable will vary linearly how to test for mean and variance what does an e-test indicate when the mean and variance of a test variable is independent? how to test mean and variance