Question 1

Which one of the following tools is not used to check the normality of residuals assumption for a multiple regression model?

Accepted Answer

A)  histogram 
B)  stem-and-leaf display 
C)  scatter diagram 
D)  normal plot

Question 2

In multiple regression analysis,a desirable residual plot has what type of appearance?

Accepted Answer

A)  curved 
B)  cyclical 
C)  fanning out 
D)  funneling in 
E)  horizontal band

Question 3

When the quadratic regression model y = β0 + β1x + β2x2 + ε is used,the term β1shows the rate of curvature of the parabola.

Accepted Answer

A) True 
 B)False

Question 4

An acceptable residual plot exhibits

Accepted Answer

A)  increasing error variance. 
B)  decreasing error variance. 
C)  constant error variance. 
D)  a curved pattern. 
E)  a mixture of increasing and decreasing error variance.

Question 5

If a particular multiple regression model has a small value of the C statistic and C for this model is less than k+1,where k is the number of independent variables in the model,then the model should be considered biased and therefore undesirable.

Accepted Answer

A) True 
 B)False

Question 6

For a given multiple regression model with three independent variables,the value of the adjusted multiple coefficient of determination is_________ less than R2.

Accepted Answer

A)  always 
B)  sometimes 
C)  never

Question 7

Adding any independent variable to a regression model will increase ____________.

Accepted Answer

A)  adjusted  
B)  s 
C)  MSE 
D)   
E)  the length of all prediction intervals

Question 8

The general form of the quadratic multiple regression models is

Accepted Answer

A)  y = β1x1 + β2x2 + ε 
B)  y = β0 + β1x1 + β2x2 + ε 
C)  y = β0 + β1x + β2x2 + ε 
D)  y = β0 + β1x2 + ε 
E)  y = β0 + β1x1 +β2x22+ ε

Question 9

The assumption of independent error terms in regression analysis is often violated when using time-series data.

Accepted Answer

A) True 
 B)False

Question 10

A ttest is used in testing the significance of an individual independent variable.

Accepted Answer

A) True 
 B)False

Question 11

In the quadratic regression model y = β0 + β1X1 + β2X12 + ε,if the term β2 is ___________ zero,then the parabola opens ____________.

Accepted Answer

A)  less than,upward 
B)  greater than,upward 
C)  greater than,either upward or downward 
D)  less than,either upward or downward 
E)  equal to,downward

Question 12

In a regression model,a value of the error term depends upon other values of the error term.

Accepted Answer

A) True 
 B)False

Question 13

In regression analysis,the standard error(s)is _________ greater than the standard deviation of y (the dependent variable).

Accepted Answer

A)  always 
B)  sometimes 
C)  never

Question 14

In using the multiple regression method,we can model the effects of the different levels of a qualitative independent variable by using a(n)____________.

Accepted Answer

A)  interaction variable 
B)  cross-product term 
C)  quadratic term 
D)  dummy (indicator)variable 
E)  variance equalizing transformation

Question 15

In general,a multiple regression model is considered to be desirable if the value of the C statistic is small and the value of C is less than _____.

Accepted Answer

A)  k 
B)  k − 1 
C)  k + 1 
D)  n − k

Exam 14: Simple Linear Regression Analysis

Which one of the following tools is not used to check the normality of residuals assumption for a multiple regression model?

In multiple regression analysis,a desirable residual plot has what type of appearance?

When the quadratic regression model y = β₀ + β₁x + β₂x² + ε is used,the term β₁shows the rate of curvature of the parabola.

An acceptable residual plot exhibits

If a particular multiple regression model has a small value of the C statistic and C for this model is less than k+1,where k is the number of independent variables in the model,then the model should be considered biased and therefore undesirable.

For a given multiple regression model with three independent variables,the value of the adjusted multiple coefficient of determination is_________ less than R².

Adding any independent variable to a regression model will increase ____________.

The general form of the quadratic multiple regression models is

The assumption of independent error terms in regression analysis is often violated when using time-series data.

A ttest is used in testing the significance of an individual independent variable.

In the quadratic regression model y = β₀ + β₁X₁ + β₂X₁² + ε,if the term β₂ is _ zero,then the parabola opens __.

In a regression model,a value of the error term depends upon other values of the error term.

In regression analysis,the standard error(s) is _________ greater than the standard deviation of y (the dependent variable) .

In using the multiple regression method,we can model the effects of the different levels of a qualitative independent variable by using a(n) ____________.

In general,a multiple regression model is considered to be desirable if the value of the C statistic is small and the value of C is less than _____.