Math Problem Statement

Calculate the residuals and organize your results in the table, using the model equation y = 4x - 5.

Solution

The table asks you to calculate residuals for the given values based on the model y=4x5y = 4x - 5.

Here's the process:

  1. Calculate the y-value from the model:
    The formula is y=4x5y = 4x - 5.
    For each xx, calculate ymodely_{\text{model}}.

  2. Find the residual:
    The residual is yobservedymodely_{\text{observed}} - y_{\text{model}}.
    For each value of xx, subtract the calculated ymodely_{\text{model}} from the observed yy.

Let’s go through it step by step:

1. First row (already filled out)

  • x=4x = -4:
    ymodel=4(4)5=165=21y_{\text{model}} = 4(-4) - 5 = -16 - 5 = -21.
    Residual: yobservedymodel=18(21)=3y_{\text{observed}} - y_{\text{model}} = -18 - (-21) = 3.

2. Second row (partially filled out)

  • x=3x = -3:
    ymodel=4(3)5=125=17y_{\text{model}} = 4(-3) - 5 = -12 - 5 = -17.
    Residual: yobservedymodel=13(17)=4y_{\text{observed}} - y_{\text{model}} = -13 - (-17) = 4.

3. Third row

  • x=2x = -2:
    ymodel=4(2)5=85=13y_{\text{model}} = 4(-2) - 5 = -8 - 5 = -13.
    Residual: yobservedymodel=10(13)=3y_{\text{observed}} - y_{\text{model}} = -10 - (-13) = 3.

4. Fourth row

  • x=1x = -1:
    ymodel=4(1)5=45=9y_{\text{model}} = 4(-1) - 5 = -4 - 5 = -9.
    Residual: yobservedymodel=7(9)=2y_{\text{observed}} - y_{\text{model}} = -7 - (-9) = 2.

5. Fifth row

  • x=0x = 0:
    ymodel=4(0)5=05=5y_{\text{model}} = 4(0) - 5 = 0 - 5 = -5.
    Residual: yobservedymodel=2(5)=3y_{\text{observed}} - y_{\text{model}} = -2 - (-5) = 3.

6. Sixth row

  • x=1x = 1:
    ymodel=4(1)5=45=1y_{\text{model}} = 4(1) - 5 = 4 - 5 = -1.
    Residual: yobservedymodel=0(1)=1y_{\text{observed}} - y_{\text{model}} = 0 - (-1) = 1.

7. Seventh row

  • x=2x = 2:
    ymodel=4(2)5=85=3y_{\text{model}} = 4(2) - 5 = 8 - 5 = 3.
    Residual: yobservedymodel=63=3y_{\text{observed}} - y_{\text{model}} = 6 - 3 = 3.

8. Eighth row

  • x=4x = 4:
    ymodel=4(4)5=165=11y_{\text{model}} = 4(4) - 5 = 16 - 5 = 11.
    Residual: yobservedymodel=1511=4y_{\text{observed}} - y_{\text{model}} = 15 - 11 = 4.

Completed Table:

xyy-value from modelResidual
-4-18-213
-3-13-174
-2-10-133
-1-7-92
0-2-53
10-11
2633
415114

Would you like more details on the residuals, or do you have any questions?

Here are some related questions:

  1. How do residuals help measure the accuracy of a model?
  2. Can residuals be negative, and what does that indicate?
  3. What would the residual be if the observed yy matches the predicted ymodely_{\text{model}}?
  4. How can you tell if a model is a good fit based on residuals?
  5. How do you calculate residuals for non-linear models?

Tip: When residuals are close to zero, it indicates the model predicts the data well.

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Math Problem Analysis

Mathematical Concepts

Residuals
Linear Equations

Formulas

y = 4x - 5
Residual = y_observed - y_model

Theorems

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Suitable Grade Level

Grades 9-12