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Read values from a graph or tableTechnique

Technique

Read values from a graph or table

Read the scale before you read the value

3 min 3 steps

A graph only fools people who skip the axes. I once read a tardy chart upside down and briefly believed I was improving.

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Used by

Match or verify a representationTacticTest the point where the choices disagree
Build a linear function from two factsTacticSlope from the change, intercept from one point
Reason about center and spreadTacticMeans follow the total, medians follow the middle
Scatterplots and best-fit modelsTacticPredictions and slopes come from the line, not the dots
Probability from tables and conditionsTacticShrink the total to the condition, then count