Linear regression

Question 1

What is the line of regression ?

Answer 1

the line of best fit

Question 2

What does x bar and y bar mean ?

Answer 2

the mean of x values and the mean of y values

Question 3

Why is x bar and y bar important ?

Answer 3

it shows how to find the point to draw the line of regression

Question 4

What is the formula for the line of regression ?

Answer 4

y = a + bx

Question 5

What is a in the line of regression formula ?

Answer 5

y intercept

Question 6

What is b in the line of regression formula ?

Answer 6

gradient

Question 7

What is interpolation ?

Answer 7

inside the data set

Question 8

What is extrapolation ?

Answer 8

outside the data set

Question 9

What is a negative of extrapolation ?

Answer 9

it could be unreliable

Question 10

What will the correlation be if the gradient is negative ?

Answer 10

negative

Question 11

What will the correlation be if the gradient is positive ?

Answer 11

positive