Math Problem Statement

Actual data creates the point (5, 9.6) on a scatterplot. The equation of the line of best fit for the data estimates that y is 10.1 when x is 5. What is the residual for (5, 9.6) and the estimated value found from the line of best fit?

Solution

Let's start by interpreting the question from the image.

We have a point (5,9.6)(5, 9.6) that represents actual data on a scatterplot. The equation of the line of best fit predicts that when x=5x = 5, y=10.1y = 10.1.

Now, the residual is the difference between the actual value and the predicted value from the line of best fit. We can calculate it as follows:

Residual=Actual yEstimated y\text{Residual} = \text{Actual } y - \text{Estimated } y Given:

  • Actual y=9.6y = 9.6
  • Estimated y=10.1y = 10.1

So: Residual=9.610.1=0.5\text{Residual} = 9.6 - 10.1 = -0.5

The residual for the point (5,9.6)(5, 9.6) is 0.5-0.5.

The estimated value from the line of best fit for x=5x = 5 is 10.110.1, as given in the problem.

Would you like a further explanation of residuals or other related topics?

Here are some related questions:

  1. What does the residual tell us about the accuracy of the line of best fit?
  2. How do you calculate the residual for different points on the scatterplot?
  3. What is the significance of residuals in regression analysis?
  4. What other methods can be used to measure the fit of a regression line?
  5. How does the size of the residual affect the overall regression model?

Tip: Residuals help assess the quality of a regression model. Smaller residuals indicate a better fit.

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Math Problem Analysis

Mathematical Concepts

Scatterplots
Residuals in regression
Line of best fit

Formulas

Residual = Actual y - Estimated y

Theorems

Concept of residuals in regression analysis

Suitable Grade Level

Grades 8-10