Deck 10: Linear Regression

Question 1

In a multiple regression analysis for every one-unit increase in x, y changes by a certain constant amount.This refers to:

A)delta
B)a
C)beta
D)b

Answer 1

b

Question 2

For every one standard deviation increase in mean initial thinking time, fatigue:

A)increased by .46 of a standard deviation
B)increased by .57 of a standard deviation
C)decreased by .57 of a standard deviation
D)stayed the same

Answer 2

increased by .46 of a standard deviation

Question 3

Questions relate to the following linear regression.
Variables Entered/Removed^b
a.All requested variables entered.
b.Dependent Variable: memory/concentration
Model Summary
a.Predictors: Constant), headaches
ANOVA^b
a.Predictors: Constant), headaches
b.Dependent Variable: memory/concentration
Coefficients^a
a.Dependent Variable: memory/concentration
The total amount of variance on memory/concentration scores in the sample which can be explained by headaches is:

A)67.6%
B)45.7%
C)42.1%
D)11.39%

Answer 3

45.7%

Question 4

The measure of mean initial thinking time:

A)significantly predicted fatigue, t=29.99, p<.001
B)significantly predicted fatigue, t=2.812, p=.009
C)did not significantly predicted fatigue, t=20.933, p=.000
D)did not significantly predict fatigue, t=2.812, p=.009

Question 5

Questions relate to the following linear regression.
Variables Entered/Removed^b
a.All requested variables entered.
b.Dependent Variable: memory/concentration
Model Summary
a.Predictors: Constant), headaches
ANOVA^b
a.Predictors: Constant), headaches
b.Dependent Variable: memory/concentration
Coefficients^a
a.Dependent Variable: memory/concentration
In the population we are 95% confident that the true regression line lays somewhere between

A)976 - 3.885
B).207 - .826
C).516 - .676
D)None of the above

Question 6

Questions relate to the following linear regression.
Variables Entered/Removed^b
a.All requested variables entered.
b.Dependent Variable: memory/concentration
Model Summary
a.Predictors: Constant), headaches
ANOVA^b
a.Predictors: Constant), headaches
b.Dependent Variable: memory/concentration
Coefficients^a
a.Dependent Variable: memory/concentration
How much variance on memory/concentration scores can we expect to be explained by headaches in the population? Which is the correct answer?

A)67.60%; the r² is adjusted upwards
B)45.70%; the r² is adjusted upwards
C)42.10%; the r² is adjusted downwards
D)11.39%; the r² is adjusted downwards

Question 7

Look at the following output, which is from a study which focused on people with ME.They were given a set of neuropsychological computerised tests, and after the testing session, they self-rated their general fatigue.The predictor variable was a measure of mean initial thinking time.
Model Summary
a.Predictors: Mean initial thinking time
ANOVA^b
a.Predictors: Constant), Mean initial thinking time
b.Dependent Variable: fatigue
Coefficients^a
Coefficients^a
a.Dependent Variable: fatigue
Which is correct? The regression equation is y=:

A)11.834x + 1.191
B)1.191x + 11.834
C)11.191x - 11.834
D)none of the above

Question 8

Questions relate to the following linear regression.
Variables Entered/Removed^b
a.All requested variables entered.
b.Dependent Variable: memory/concentration
Model Summary
a.Predictors: Constant), headaches
ANOVA^b
a.Predictors: Constant), headaches
b.Dependent Variable: memory/concentration
Coefficients^a
a.Dependent Variable: memory/concentration
The regression equation for the above analysis is:

A)memory/concentration = .516memory/concentration) +2.430
B)headaches = .516 headaches) + 2.430
C)memory/concentration = .676memory/concentration) +2.430
D)headaches = .676headaches) + 2.430

Question 9

What is the point at which the regression line crosses the y axis known as?

A)a
B)b
C)β
D)α

Question 10

Questions relate to the following linear regression.
Variables Entered/Removed^b
a.All requested variables entered.
b.Dependent Variable: memory/concentration
Model Summary
a.Predictors: Constant), headaches
ANOVA^b
a.Predictors: Constant), headaches
b.Dependent Variable: memory/concentration
Coefficients^a
a.Dependent Variable: memory/concentration
The variable 'headaches' is the

A)predictor variable
B)criterion variable
C)dependent variable
D)standard variable