1.Comparative Analysis of Intervention Effectiveness
Histograms and bar charts · 2026
An education analyst evaluated whether test preparation courses improved student exam scores compared to demographic factors. The dashboard revealed a +10.5 point difference for parental education, an +8.6 point gap for lunch status, and a +7.6 point lift for test prep. The prep advantage peaked at 9.4 points for students whose parents had some college education. The overall distribution showed a mean of 67.8 and a median of 68.3, with the interquartile range between 58.3 and 77.7. Students with no prep averaged 65.0, while those who completed the course averaged 72.7.
What it shows:
How to objectively weigh intervention effectiveness against systemic demographic gaps.




