The following are the results of a fictitious study, which investigates whether a new drug (Drug A) is more effective than a placebo (i.e., an inactive substance) in the treatment of depression. The researcher is also interested in whether the effects of the drug varies by age so participants between the ages of 18-39 years were recruited (the younger adult group), and participants between the ages of 60-80 years were recruited (the older adult group). Participants were randomly assigned to either the placebo group or to the drug group (Drug A). After 2 months of taking either the placebo or Drug A, participants completed a measure of depressive symptomology called the Beck Depression Inventory-II (BDI-II).

Interpret the data table and bar graph provided.

Part 1: Calculating the Mean, Median, and Mode Younger Adults Younger Adults Older Adults Younger Adults Placebo Drug A Placebo Drug A Mean 26.4 10.4 26.2 23.4 Median 23 10 29 24 Mode 23 10 and 8 None None Part 2: Summary Data for Graph Beck Depression Inventory-II Mean Scores by Participant Condition and Age Group 30 26.4 26.2 23.4 BDI-II Scores 10.4 Younger Adults Older Adults Placebo Drug A Participant Condition