Florida B.E.S.T. MA.8.DP.1.3
The Standard
Given a scatter plot with a linear association, informally fit a straight line.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students examine a scatter plot and draw a reasonable line through the center of the point cloud. They use the overall direction and balance of the data rather than connecting individual points.
What Mastery Looks Like
- A student draws a line that follows the point cloud and leaves roughly equal numbers of points above and below it. The student can compare two possible lines and explain which one better represents the data.
Common Misconceptions
- Students may connect the dots, use only the first and last points, or force the line through the origin. They may also expect every point to touch the line or let one outlier control its placement.
How to Assess It
- Give students a scatter plot with 12 points and ask them to draw a trend line. Have them explain how the points above and below support their choice.
Lesson moves
Ways to Teach It
Plot paired data with sticky dots on grid paper, then use string to test lines and choose one that balances the points.
Display two candidate lines on one scatter plot and ask students to defend the better fit using direction, closeness, and balance.
Match scatter plot cards with candidate line cards, earning a point only when the selected fit is explained correctly.
Graph class shoe length and height data, then draw a trend line and compare it with classmates' lines.
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