QNT 275 Week 4 Quiz

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qQuestion1

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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