Whats my grade? In Professor Friedmans economics course the correlationbetween the
Chapter 0, Problem 5.31(choose chapter or problem)
Whats my grade? In Professor Friedmans economics course the correlationbetween the students total scores prior to the final examination and theirfinal-examination scores is r = 0.6. The pre-exam totals for all students in thecourse have mean 280 and standard deviation 30. The final-exam scores havemean 75 and standard deviation 8. Professor Friedman has lost Julies final exam but knows that her total before the exam was 300. He decides to predict herfinal-exam score from her pre-exam total.(a) What is the slope of the least-squares regression line of final-exam scores onpre-exam total scores in this course? What is the intercept?(b) Use the regression line to predict Julies final-exam score.(c) Julie doesnt think this method accurately predicts how well she did on thefinal exam. Use r 2 to argue that her actual score could have been much higher (ormuch lower) than the predicted value.
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