Math Problem Statement

Based on the scatterplots, which statement CANNOT be true?

Solution

To solve this problem, we analyze the two scatterplots and the given answer choices.

  • Plot A shows a clear nonlinear relationship; the points curve, indicating a parabolic shape, which is typical of a nonlinear relationship.
  • Plot B shows a negative linear relationship, as the points appear to follow a downward sloping straight line.

Now, let's evaluate each option:

  1. Option A: Plot A indicates a nonlinear relationship between the variables.

    • This is true since Plot A shows a curved (parabolic) pattern.
  2. Option B: Plot B indicates a linear relationship between the variables.

    • This is true since Plot B shows points that follow a linear trend.
  3. Option C: The correlation coefficient for the data in Plot B is close to 1.

    • This cannot be true. A correlation coefficient of 1 indicates a perfect positive linear relationship. However, Plot B shows a negative linear relationship, so the correlation should be close to -1, not 1.
  4. Option D: The correlation coefficient for the data in Plot A is close to 0.

    • This is true. Since Plot A shows a nonlinear pattern, the correlation coefficient would not capture the relationship well and would likely be close to 0.
  5. Option E: The r2r^2 value of the least-squares regression line for Plot B is greater than the r2r^2 value of the least-squares regression line for Plot A.

    • This is true. Plot B follows a strong linear trend, so the r2r^2 value would be high, while Plot A's r2r^2 value would be lower due to its nonlinear pattern.

Thus, the statement that cannot be true is Option C: The correlation coefficient for the data in Plot B is close to 1.

Would you like more details on the concepts of correlation and r2r^2 values?

Here are 5 related questions for deeper understanding:

  1. What is the difference between correlation and r2r^2 in data analysis?
  2. How is the correlation coefficient calculated, and what are its typical ranges?
  3. Can a nonlinear relationship ever have a high r2r^2 value? If so, under what conditions?
  4. What are some methods for detecting nonlinear relationships in scatterplots?
  5. How does the least-squares regression line differ between linear and nonlinear models?

Tip: In scatterplot analysis, the correlation coefficient reflects the strength and direction of a linear relationship, while the r2r^2 value measures the proportion of variance explained by a model, which can apply to both linear and nonlinear fits.

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Math Problem Analysis

Mathematical Concepts

Statistics
Correlation
Scatterplots
Linear Relationships
Nonlinear Relationships
r-squared value

Formulas

Correlation coefficient (r)
r^2 value

Theorems

Least-squares regression line

Suitable Grade Level

Grades 9-12