StatTutor Lesson - Cautions about Correlation and Regression

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      Question 1

      69

      Question 1.

      What types of relationships should be described by a least squares line?

      		A.
      		B.
      		C.
      Incorrect. Only linear relationships should be described by a least squares line.
      Correct. Only linear relationships should be described by a least squares line.
      Incorrect. Try again.
      2

      Questions 2-3

      131

      Question 2.

      True or false: Correlation is resistant to outliers.

      		A.
      		B.
      Incorrect. Correlation is definitely affected by outliers.
      Correct. Correlation is definitely affected by outliers.
      Incorrect. Try again.
      2

      Questions 4-5

      178

      Question 4.

      In regression, all outliers are influential.

      		A.
      		B.
      Incorrect. If an outlier is close to the regression line found without the outlier, then it will not be influential.
      Correct. If an outlier is close to the regression line found without the outlier, then it will not be influential.
      Incorrect. Try again.
      2

      Questions 6-8

      267

      Question 6.

      Why should you avoid extrapolation?

      		A.
      		B.
      		C.
      Incorrect. Extrapolation should be avoided because the relationship may be different between X and Y for that X and it will yield an inaccurate prediction.
      Correct. Extrapolation should be avoided because the relationship may be different between X and Y for that X and it will yield an inaccurate prediction.
      Incorrect. Try again.
      2

      Questions 9-10

      507

      Question 9.

      What is the name of the variable that may influence the relationship between X and Y?

      		A.
      		B.
      		C.
      Incorrect. X is the explanatory variable and Y is the response variable. A lurking variable is a variable that affects their relationship.
      Correct. X is the explanatory variable and Y is the response variable. A lurking variable is a variable that affects their relationship.
      Incorrect. Try again.
      2