How well do exams given during the semester predict performance on the final? One class had three tests during the semester. Computer output of the regression gives

a) How much of the variation in final exam scores is accounted for by the regression model?
b) Explain in context what the coefficient of Test 3 scores means.
c) A student argues that clearly the first exam doesn't help to predict final performance. She suggests that this exam not be given at all. Does Test l have no effect on the final exam score? Can you tell from this model?
d) Write the equation of the regression model.

Transcribed Image Text:

Dependent variable is Final s 13.46 R-Sq 77.7% R-Sq(adj)-74.1% Predictor Coeff SE(Coeff) Intercept 6.72 Test Test2 Test3 P-value 0.636 3 0.274 0.091 0.9015 0.2086 4.32 <0.0001 14.00 -0.48 0.2560 0.2274 1.1 0.3912 0.2198 1.78 Analysis of Variance Source DF SS MS F P-value Regression 3 11961.8 3987.3 2202 <0.0001 Error Total 19 3440.8 181.1 22 15402.6