a personnel director at a large company studied the eating habits of employees by watching the movements of a selected group of employees at lunchtime. the purpose of the study was to determine the proportion of employees who buy lunch in the cafeteria, bring their own lunches, or go out to lunch. if the director selects 50 employees at random from throughout the company and categorizes their lunchtime practices by gender, she is: a) testing for a lurking variable b) blocking for gender c) promoting sexual harassment d) testing for bias e) none of the above