Math Problem Statement

For the plot below the value of r2 is 0.7783.

Which of the following sets of statements is true?

About 78% of the variation in ticket price can be explained by the distance flown.

The correlation coefficient, r, is 0.882.

About 78% of the variation in distance flown can be explained by the ticket price.

The correlation coefficient, r, is 0.606.

About 22% of the variation in ticket price can be explained by the distance flown.

The correlation coefficient, r, is 0.606.

About 88% of the variation in ticket price can be explained by the distance flown.

The correlation coefficient, r, is 0.882.

Solution

To solve this, we need to use the fact that the coefficient of determination r2r^2 is given as 0.7783. The relationship between the correlation coefficient rr and r2r^2 is as follows:

r=±r2r = \pm \sqrt{r^2}

Thus, we can calculate rr:

r=0.77830.882r = \sqrt{0.7783} \approx 0.882

Interpretation of Statements:

  1. "About 78% of the variation in ticket price can be explained by the distance flown."

    • This is correct because r2=0.7783r^2 = 0.7783, which means 77.83% of the variation in ticket price is explained by the distance flown.
  2. "The correlation coefficient, r, is 0.882."

    • This is correct because r=0.77830.882r = \sqrt{0.7783} \approx 0.882.
  3. "About 78% of the variation in distance flown can be explained by the ticket price."

    • This statement is false. r2r^2 here refers to the percentage of variation in ticket price explained by the distance flown, not the other way around.
  4. "The correlation coefficient, r, is 0.606."

    • This is false. The correlation coefficient is 0.882, not 0.606.
  5. "About 22% of the variation in ticket price can be explained by the distance flown."

    • This is false. 100%77.83%=22.17%100\% - 77.83\% = 22.17\%, so 22% of the variation in ticket price cannot be explained by the distance flown.
  6. "About 88% of the variation in ticket price can be explained by the distance flown."

    • This is false because 77.83% of the variation in ticket price can be explained, not 88%.

Conclusion:

The true set of statements is:

  • "About 78% of the variation in ticket price can be explained by the distance flown."
  • "The correlation coefficient, r, is 0.882."

Would you like further details or have any other questions?


Here are some related questions to consider:

  1. How is the r2r^2 value interpreted in linear regression?
  2. What is the difference between rr and r2r^2 in correlation analysis?
  3. How would the value of rr change if the variables were inversely related?
  4. Can r2r^2 be negative in any scenario?
  5. How do outliers affect the correlation coefficient rr?

Tip: The closer the correlation coefficient rr is to 1 or -1, the stronger the linear relationship between the two variables.

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Math Problem Analysis

Mathematical Concepts

Statistics
Linear Regression
Correlation
Coefficient of Determination (r^2)

Formulas

r = ±√r²
r² = Explained variation / Total variation

Theorems

Coefficient of Determination Theorem

Suitable Grade Level

Grades 10-12