A Researcher Designed a Study to Test Whether Players of the "Drop

Short Answer

A researcher designed a study to test whether players of the "Drop 7" smartphone app at-tain a higher score if offered a monetary incentive. Of 40 volunteers, 20 were randomly as-signed to a group where high scorers were paid $5 and the other 20 to a group simply told to "do your best." The researcher found that, on average, the volunteers in the group getting the monetary incentive scored substantially higher than those who did not receive a mone-tary incentive (mean score of 13,500 points in the group without the monetary incentive; 15,900 points in the monetary incentive group). Identify the steps of a statistical investiga-tion in this study by answering the following questions about this study.
-Step 2: Design a study and collect data. How many observational units did the researcher collect data on?