StatTutor Lesson - Residuals

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Residuals BPS6e
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      Question 1

      51

      Question 1.

      Do all of the data points lie on the regression line or are there errors?

      A.
      B.

      Correct.
      Incorrect.
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      Questions 2-6

      98

      Question 2.

      Visually, what is a residual?

      A.
      B.
      C.

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      Question 7

      138

      Question 7.

      Fill in the blank: A residual plot is a ____________ of the x-values plotted against the residuals.

      A.
      B.
      C.

      Correct.
      Incorrect.
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      Question 8

      204

      Question 8.

      What pattern in a residual plot indicates that conditions are met?

      A.
      B.
      C.

      Correct.
      Incorrect.
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      Questions 9-10

      281

      Question 9.

      What is the purpose of a residual plot?

      A.
      B.

      Correct.
      Incorrect.
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      Questions 11-12

      411

      Question 11.

      True or false: These outliers will not have any effect on the values of slope and y-intercept.

      A.
      B.

      Correct. These outliers will affect the means and standard deviations of the X’s and the Y’s as well as the correlation coefficient. Thus, they will definitely affect the values of slope and y-intercept.
      Incorrect. These outliers will affect the means and standard deviations of the X’s and the Y’s as well as the correlation coefficient. Thus, they will definitely affect the values of slope and y-intercept.
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      Applet

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