n Professor Krugman's economics course, the correlation between the students' total scores prior to the final examination and their final‑examination scores is ?=0.5.�=0.5. The pre‑exam totals for all students in the course have mean 280280 and standard deviation 40.40. The final‑exam scores have mean 7575 and standard deviation 8.8. Professor Krugman has lost Julie's final exam but knows that her total before the exam was 300.300. He decides to predict her final‑exam score from her pre‑exam total. © Macmillan Learning (b) Use a regression line to predict Julie's final‑exam score. Give your answer as a whole number. ?̂ =�^=
n Professor Krugman's economics course, the
(b) Use a regression line to predict Julie's final‑exam score. Give your answer as a whole number.
Solution:
Given information:
Let x= The pre‑exam totals
and y= The final‑exam scores
r= 0.5 Correlation between x and y
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