A large company wants to compare two incentive plans for increasing sales. The company randomly assigns a number of its sales staff to receive each kind of incentive and compares the average change in sales of the employees under the two plans. Is this study a survey, an experiment, an observational study, or a case study?

an observational study

Explanation:An observational study is a study where a researcher collect the infomation or data from their observation, based on what they see or hear but a researcher doesn't control or interfere or try to manipulate the study . A researcher observes and record what they see as they see it , this method observe subjects in their natural environment because it is believed that participantsor subjects can portray their true behavior when they are observed in their natural environment.

answer; approx,300,000 ;