Final Jeopardy
Your AP Psychology teacher wants to test a new study method called Active Recall Drills to see if it improves quiz scores compared to the traditional Highlight-and-Review method.
-Group A (Active Recall Drills): Mean quiz score = 84/100, SD = 1
-Group B (Highlight-and-Review): Mean quiz score = 78/100, SD = 1
- the statistical analysis shows a p-value = .001 and an effect size (Cohen’s d) = 1.0.
Questions:
What does the p-value tell you about the difference between the two groups?
What does the effect size tell you about the size/meaningfulness of the difference?
How does the standard deviation support your understanding of the results?
Based on all three measures, how would you summarize these findings?
p = .001 → The difference is very unlikely due to chance; statistically significant.
Effect size d = 1.0 → Large, meaningful difference; Active Recall Drills have a strong impact on scores.
SD = 1 for both groups → Low variability; scores are consistent within each group, making the difference more trustworthy.
Summary: confident the Active Recall Drills produced a real and substantial improvement in quiz scores, with consistent results across students — making it a strong candidate for classroom adoption