NY Next Generation Math NY-7.SP.3

Math7th GradeDraw informal comparative inferences about two populations.

The Standard

Informally assess the degree of visual overlap of two quantitative data distributions.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students compare two quantitative data distributions by looking at how much their displays overlap. They use the separation and shared region to describe how similar or different the groups appear.
What Mastery Looks Like: A student identifies the interval where two aligned dot plots overlap and describes whether the overlap is small or large. The student supports the comparison with visible features from both distributions.
Common Misconceptions: Students may compare only the highest values or treat any overlap as proof that the groups are the same. They may also overlook different scales or spreads when judging the shared region.
How to Assess It: Show two aligned dot plots of quiz scores. Ask students to mark the shared interval and write one evidence-based sentence about the degree of overlap.

Lesson moves

Overlay two distributions printed on transparent sheets, shade the shared region, and describe how much of each group overlaps.
Ask students what large visual overlap suggests about two groups and what it does not prove.
Match paired distribution cards to descriptions of small, moderate, or large overlap, then defend each match.
Compare displayed commute-time data for two routes and use visual overlap to describe how differently the travel times vary.

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