1.Gap Analysis for Evaluating Interventions
Histograms and bar charts · 2026
An education analyst used a dashboard with histograms and bar charts to evaluate whether test preparation courses improve student exam scores compared to demographic factors. The analysis quantified the relative impact of prep courses (+7.6 points), lunch status (+8.6 points), and parental education (+10.5 points). A histogram displayed an overall distribution with a mean of 67.8 and a median of 68.3, highlighting an interquartile range of 58.3 to 77.7. By contrasting the 65.0 average for students with no prep against the 72.7 average for those who completed the course, stakeholders could objectively weigh intervention effectiveness.
What it shows:
How to use gap analysis to objectively measure the impact of development programs against baseline factors.




