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StatTutor Lesson - Estimating the Parameters

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      Question 1

      199

      Question 1.

      What is the parameter symbol representing the theoretical slope?

      		A.
      		B.
      		C.
      		D.
      Correct. β is the parameter symbol for the theoretical slope.
      Incorrect. β is the parameter symbol for the theoretical slope.
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      Question 2

      316

      Question 2.

      What does “s” in regression measure?

      		A.
      		B.
      		C.
      Correct. “s” is computed using the residuals. Each residual measure the vertical distance of a y-value from the regression line. So, “s” measures the variability of the y’s about the regression line.
      Incorrect. “s” is computed using the residuals. Each residual measure the vertical distance of a y-value from the regression line. So, “s” measures the variability of the y’s about the regression line.
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      Question 3

      364

      Question 3.

      True or false: One of the conditions for inference in regression is that the standard deviation in the y’s is constant for all x-values. σ is the measure of this constant variability.

      		A.
      		B.
      Correct. This is a correct statement. “s” estimates this σ and measures the variability of the y’s about the regression line.
      Incorrect. This is a correct statement. “s” estimates this σ and measures the variability of the y’s about the regression line.
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      Question 4

      378

      Question 4.

      True or false: This s = 4.2520 measures the variability of the data about their mean.

      		A.
      		B.
      Correct. s = 4.2520 measures the variability of the y’s about the regression line.
      Incorrect. s = 4.2520 measures the variability of the y’s about the regression line.
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