8: Variables

Question 1

r

Answer 1

Pearson’s r — correlation coefficient

Question 2

ρ

Answer 2

Rho — population correlation

Question 3

t

Answer 3

Test statistic

Question 4

df

Answer 4

Degrees of freedom — (n-2) or (n-k) — regressive df

Question 5

X

Answer 5

Any independent variable

Question 6

Y

Answer 6

Any dependent variable

Question 7

ŷ

Answer 7

Y hat — estimated y value of a x value

Question 8

a

Answer 8

Y intercept

Question 9

b

Answer 9

Slope

Question 10

X

Answer 10

Any value of an independent variable

Question 11

ȳ

Answer 11

Mean of y — the dependent variable

Question 12

x̅

Answer 12

Mean of x — independent variable

Question 13

β

Answer 13

Beta — population slope for regression equation

Question 14

b

Answer 14

Estimate of regression line’s slope from sample info

Question 15

Sb

Answer 15

Standard error of slope estimate

Question 16

Sy·x

Answer 16

Standard error of estimate

Question 17

y·x

Answer 17

Standard error of y for a given value of x

Question 18

r²

Answer 18

Coefficient of determination

Question 19

SSR

Answer 19

Regression sum of squares

Question 20

SSE

Answer 20

Residual or Error sum of squares

Question 21

SST

Answer 21

Total sum of squares

Question 22

MSE

Answer 22

Mean square error

Question 23

k

Answer 23

Number of independent variables in multiple regression analysis

Question 24

b1

Answer 24

Regression coefficient for 1st independent variable

Question 25

bk

Answer 25

Regression coefficient for any independent variable

Question 26

Sbi

Answer 26

…

Question 27

D̄

Answer 27

Mean difference