Question

I have no idea how to do this...

In Professor Krugman’s economics course the correlation between the students’ total scores prior to the final examination and their final-examination scores is The pre-exam totals for all students in the course have mean 280 and standard deviation 40. The final-exam scores have mean 75 and standard deviation 8.
17. What is the least-squares regression line of final-exam scores on pre-exam total scores in this course?
A. ŷ = −47 + 0.1x
B. ŷ = 47 + 0.1x
C. ŷ = 47 − 0.1x
D. ŷ = −47 − 0.1x

Answer 1

i got banana as an answer

Answer 2

please use the chatroom if you feel the need for attention from people, I need a serious explanation

Answer 3

here are the formulas
http://en.wikipedia.org/wiki/Simple_linear_regression

you will need the correlation coefficient

Answer 4

Got it right, B :)

Answer 5

alright then , good job :)