QNT 275 Week 4 Quiz

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Week 4 Quiz

     question1

For a given set
of explanatory variables, in general:


o    

a confidence
interval is narrower than a prediction interval.


o    

a confidence
interval is wider than a prediction interval.


o    

The width of a
confidence interval cannot be determined.


o    

the width of a
confidence interval is the same as the width of a prediction interval.


 

 

     question2

The standard
error of the estimate measures:


o    

the variability
of the observed y-values around the predicted y-values.


o    

the variability
of the predicted y-values around the mean of the observed y-values.


o    

the variability
of the values of the sample regression coefficients.


o    

the variability
of the explanatory variables.


 

 

     question3

In a simple
linear regression model, if the plots on a scatter diagram lie on a straight
line, what is the standard error of the estimate?


o    

+1

o    

-1

o    

Infinity

o    

0

 

 

     question4

Which of the
following variables is not qualitative?


o    

Gender of a
person


o    

Religious
affiliation


o    

Student's status
(freshman, sophomore, etc.)


o    

Number of
dependents claimed on a tax return


 

 

     question5

Consider the
following simple linear regression model:   
The response variable is:


o    

β0

o    

x

o    

y

o    

ε

    

    

    

     question6

Another name for
an explanatory variable is the ___.


o    

descriptive
variable


o    

independent
variable


o    

inferred
variable


o    

dependent
variable


    

    

    

    

     question7

Serial
correlation is typically observed in:


o    

outliers.

o    

sparse data.

o    

cross-sectional
data.


o    

time series
data.


 

 

 

 

     question8

Consider the
following simple linear regression model:   
β0 and β1 are:


o    

the unknown
parameters.


o    

the random error
terms.


o    

the response
variables.


o    

the explanatory
variables.


 

 

 

 

     question9

What is the name
of the variable that's used to predict another variable?


o    

Coefficient of
Determination


o    

Standard Error
of the Estimate


o    

Response

o    

Explanatory

 

 

 

 

     question10

Which of the
following violates the assumptions of regression analysis?


o    

The error term
has a constant variance.


o    

The error term
has a zero mean.


o    

The error term
is normally distributed.


o    

The error term
is correlated with an explanatory variable.


 
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