when comparing characteristics of individuals do we need to standardize what variables do we use to compare subpopulations do you do normalization do you need normalization of subpopulations are z scores normal how to compare subpopulations of people what is meant by the comparison of three subpopulations what is the difference between y and z in a typical subpopulation? do I need to normalize the subpopulations in statistics do you need to normalize the z score when comparing subpopulations? when you are comparing subpopulations which are usually independent variable when to use subpopulations vs subpopulations what is the difference between the salary of the individual and the Y of the subpopulation how do you normalize subpopulations? comparison of subpopulations why do I need normalization in population comparison what is the normalized subpopulation why does a subpopulation have two differences? what is meant by the comparison of characteristics of three subpopulations why do subpopulations need normalization