The regression equation: 5 1.2x was calculated from a sample. It is part of a re

Question

The regression equation: 5 1.2x was calculated from a sample. It is part of a regression model that has been developed in order to predict the score in an end-of-year exam based on the score in a mid-year exam for a particular university course. In the sample, mid-year scores ranged from 50 to 72. Select whether or not each of the following conclusions are correct from the regression analysis: Not Correct correct a) For an increase by one in the mid-year score, the predicted increase in b) If a student achieves a score of 45 in the mid-year exam then they will e If a student achieves a score of 60 in the mid-year exam then they will end-of-year score is 5. achieve a score of 59 in the end-of-year exam. achieve a score of 77 in the end-of-year exam.

Explanation / Answer

Solution.

a). Not correct. The predicted increase in end of year score as is seen from the model is 1.2

b). True. The predicted score in end of year score is = 5+1.2*45 = 59

c). True. The predicted score in end of year score is = 5+1.2*60 = 77

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