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. 1. The study could best be categorized as _______. a) a census b) a survey sample c) an observational study d) a designed experiment e) none of these 2. If the director includes only the employees in one department in her study, she is performing a _______. a) simple random sample b) quota sample c) convenience sample d) multi-stage sample e) census 3. If the director selects 50 employees at random from throughout the company and categorizes their lunchtime practices by gender, she is _______. a) blocking for gender b) testing for a lurking variable c) promoting sexual harassment d) testing for bias e) none of these