Math 1 · Unit 10 · Lesson 3 · part 5 of 5
Practice Problems
Try them, get help one step at a time, then print how it went.
Practice: try it, then get help one step at a time
Compute residuals, read above and below, and decide from a residual plot whether a line is appropriate. Hint gives a nudge, Show next step shows one worked step at a time, Reveal answer checks, and Hide help / start over clears the card. Actual minus predicted, every time.
My results
Finished the practice? Print a page that shows each question, what you typed or chose, the correct answer, and how it went. Good for showing a teacher or keeping in a folder.
Exit ticket
On paper or an index card. Use the math word and the plain-English word.
- What is a residual? Write the subtraction.
- A model predicts 50 and the actual value is 44. Find the residual and say where the point is.
- A residual plot shows a clear U shape. What does that tell you?
- A line gives r = 0.98 but the residuals make a pattern. Should you use the line? What three things do you check?
Check your exit ticket
- Actual minus predicted: how far off the model is for one point.
- 44 − 50 = −6. Below the line: the model guessed too high.
- The data is curved. A line is the wrong family.
- No. Check the scatter plot, r, and the residual plot together.