Back to Assess fit by analyzing residuals — Problem 2 · Task Set 7
Exercises: Assess Fit by Analyzing Residuals
Work through each section in order. A residual is observed minus predicted: positive when the data point is ABOVE the model, negative when below. Keep the sign. When reading a residual plot, remember the key idea: random scatter around zero means a GOOD fit, while a clear pattern (a curve or a fan) means the model is wrong.
Grade 10·20 problems·~35 min·Common Core Math - HS Statistics and Probability·standard·hss-id-b-6b
Work through problems with immediate feedback
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Warm-Up: What Is a Residual?
These problems review the residual definition and its sign.
1.
A line models a phone bill, where is minutes used. At minutes a customer was actually charged . The model predicts . What is the residual (observed predicted) for this customer?