ch 7/8 Flashcards
1
Q
what does b0 stand for
A
intercept
2
Q
what does b1 stand for
A
slope
3
Q
what do xbar and ybar stand for
A
mean of x and mean of y
4
Q
when trying to find the regression line what information is needed
A
b0 (intercept) and b1(slope)
5
Q
what is the residual
A
the difference between predicted y value and actual y value
6
Q
what does r^2 represent
A
the amount of variation in the y values that is explained by the regression line
7
Q
if the correlation between 2 variables in 0.05, what percentage of variation is explained by the regression line?
A
0.25
8
Q
what is extrapolation
A
when an x value is inputted that is not in the observed range
