A researcher is interested in the treatment of ADHD. One hundred and fifty students between the ages of 8-10 participated in the study. Fifty received medication (stimulant), 50 received behavioral therapy (12 weekly sessions), and 50 received a combination (12 sessions & medication). After 12 weeks, all subjects were administered the Connors Rating Scale, a measure of ADHD, to see if there is a difference among the groups. How would this be analyzed?

Which statisitical test would be most appropriate?

Identify the variables (and levels if applicable)

Identify the scale of measurement

CHOOSE FROM THE FOLLOWING STATISTICS: DEPENDENT-SAMPLES t TEST ONE-FACTOR (ONE-WAY) REPEATED MEASURES ANOVA INDEPENDENT-SAMPLES t TEST (TWICE) ONE-WAY ANOVA (TWICE) ONE-FACTOR (ONE-WAY) ANALYSIS OF COVARIANCE FACTORIAL (TWO-WAY) ANOVA