Me choose the correct answer from the parentheses to fill in the blank for each statement! ! : 1. in an observational study, randomization of (occurs or does not occur? ) 2. a survey makes inferences about a population (a sample, a study, an experiment? ) of the population. 3. in an experiment, a treatment is imposed on those being studied to discern any differences in (a control, a response, an independent? ) variable.