An investigator conducts an experiment involving the effects of three levels of a drug on memory. Subjects are randomly assigned to one of three conditions. A different drug level is administered in each condition. Memory is measured 10 minutes after each subject receives the drug. The following scores are recorded. The higher the score, the better the memory. F _obt = _________. A) 8.31 B) 7.30 C) 7.27 D) 6.45

Question

Quizplus · Accepted Answer

The mean scores for each condition are as follows: 
Condition 1: (6 + 7 + 9)/3 = 7.33 
Condition 2: (7 + 6 + 8)/3 = 7 
Condition 3: (5 + 7 + 8)/3 = 6.67

To find the overall mean, we add up all the scores and divide by the total number of subjects: 
(6 + 7 + 9 + 7 + 6 + 8 + 5 + 7 + 8) / 9 = 7.22

Therefore, the closest answer choice to the overall mean is C (7.27).

An Investigator Conducts an Experiment Involving the Effects of Three