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Introduction to Linear Regression

Answers

  1. Plug  X = 4 into the equation to find Y'= 3(4) - 2 = 10

  2. Plug  A = 40 into the equation to find B'= 2.3(40) + 9.5 = 101.5

  3. Predicted value, B' = 2.3(32.5) + 9.5 = 84.25 ; Error of prediction = B - B' = 95.25 - 84.25 = 11

  4. Plug A = 40 into the equation to find B'= 2.3(40) + 9.5 = 101.5

  5. Someone who scored the mean on  X would be predicted to score the mean on Y .

  6. b = r(sY/sX) = .5(1/2) = .25

  7. b = 0.9143