Describe the explained variation about a regression line in words and in symbols. y x (X₁, Yj) • (x,y) (x, y) |y=j C Choose the correct answer below. O A. The explained variation is the sum of the squares of the differences between the predicted y-values and the mean of the y-values of the ordered pairs. B. The explained variation is the sum of the squares of the differences between the y-values of each ordered pair and the mean of the y-values of the ordered pairs. C. The explained variation is the sum of the squares of the differences between the observed y-values and the predicted y-values.

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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### Understanding Explained Variation in Regression

**Task:** Describe the explained variation about a regression line in words and in symbols.

**Graph Explanation:**
The graph depicts a scatter plot with a regression line. It includes several key elements:
- The horizontal axis is labeled \(x\) and the vertical axis is labeled \(y\).
- Data points are shown as black dots.
- The regression line is represented by a straight line that best fits the data points.
- Points of interest are labeled \((x_i, y_i)\), \((x_i, \hat{y}_i)\), and \((x_i, \bar{y})\).
- A horizontal line at \(y = \bar{y}\) represents the mean of the \(y\)-values.
- A vertical dashed pink line illustrates the distance between the actual data point \((x_i, y_i)\) and the mean line \(\bar{y}\).

**Question:** Choose the correct answer below.

- **A.** The explained variation is the sum of the squares of the differences between the predicted \(y\)-values and the mean of the \(y\)-values of the ordered pairs.
- **B.** The explained variation is the sum of the squares of the differences between the \(y\)-values of each ordered pair and the mean of the \(y\)-values of the ordered pairs.
- **C.** The explained variation is the sum of the squares of the differences between the observed \(y\)-values and the predicted \(y\)-values.
Transcribed Image Text:### Understanding Explained Variation in Regression **Task:** Describe the explained variation about a regression line in words and in symbols. **Graph Explanation:** The graph depicts a scatter plot with a regression line. It includes several key elements: - The horizontal axis is labeled \(x\) and the vertical axis is labeled \(y\). - Data points are shown as black dots. - The regression line is represented by a straight line that best fits the data points. - Points of interest are labeled \((x_i, y_i)\), \((x_i, \hat{y}_i)\), and \((x_i, \bar{y})\). - A horizontal line at \(y = \bar{y}\) represents the mean of the \(y\)-values. - A vertical dashed pink line illustrates the distance between the actual data point \((x_i, y_i)\) and the mean line \(\bar{y}\). **Question:** Choose the correct answer below. - **A.** The explained variation is the sum of the squares of the differences between the predicted \(y\)-values and the mean of the \(y\)-values of the ordered pairs. - **B.** The explained variation is the sum of the squares of the differences between the \(y\)-values of each ordered pair and the mean of the \(y\)-values of the ordered pairs. - **C.** The explained variation is the sum of the squares of the differences between the observed \(y\)-values and the predicted \(y\)-values.
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