Question

The least-squares regression line for the scatterplot is:
test grade= 73.7788 + 4.1830 # of hours studied.
A.Given that Sx= 1.5751 and Sy= 8.6415, calculate the correlation, r.
B.Use your answer from part (B) and calculate r2. Interpret this value.

Answer 1

A) Slope is slope - in this case, the rate of change of grade with study time. (Where do *you* fall in this group, I wonder?)

B) The correlation is
sum[ (x - <x>)(y - <y>) ] / [(n-1) Sx Sy]
where <x> and <y> are the means of the x and y data, and Sx and Sy are the standard deviations.

Answer 2

yeah i can look on yahoo.answers too to get that answer bud. First off A. is not an answer/ answer im looking for. Second I don't know what x, y and n are in that equation or else I would've just done it myself. Nice try but your no help @boldjon