Linear regression Flashcards
unit 4.2
1
Q
What is the line of regression ?
A
the line of best fit
2
Q
What does x bar and y bar mean ?
A
the mean of x values and the mean of y values
3
Q
Why is x bar and y bar important ?
A
it shows how to find the point to draw the line of regression
4
Q
What is the formula for the line of regression ?
A
y = a + bx
5
Q
What is a in the line of regression formula ?
A
y intercept
6
Q
What is b in the line of regression formula ?
A
gradient
7
Q
What is interpolation ?
A
inside the data set
8
Q
What is extrapolation ?
A
outside the data set
9
Q
What is a negative of extrapolation ?
A
it could be unreliable
10
Q
What will the correlation be if the gradient is negative ?
A
negative
11
Q
What will the correlation be if the gradient is positive ?
A
positive
