STAT 211 FINAL EXAM QUESTIONS AND
100% CORRECT ANSWERS!!
Compared to the confidence interval estimate for an average value of y (in a linear
regression model), the prediction interval estimate for a particular value of y will be _____.
Wider
In multiple regression, the critical region used for testing the significance of an individual
independent variable is located ______________________________.
in both tails of the distribution.
The difference between the observed value of the dependent variable and the value
predicted by using the estimated regression equation is the _____.
residual
The following are all assumptions on the error term in simple linear regression EXCEPT
error variance is non-constant
In a residual plot against x that does NOT suggest we should challenge the assumptions of
our regression model, we would expect to see a _____.
horizontal band of points centered near 0
A simple linear regression model has _____.
only one independent variable
The number of times each factor-level combination (treatment) is observed in a factorial
design is known as a(n) _____.
replication
If a blocking variable is needed, but not used, the variation from that source will be
expressed in the __________________________________________.
MSE
, In a simple linear regression analysis, if the slope is negative, then it must be true that
_____________________________________________.
there is a negative correlation between x and y
The following estimated regression model was developed relating yearly income (y in
$1000s) of 30 individuals with their age (x1) and their gender (x2) (0 if male and 1 if
female).
ŷ = 30 + 0.7x1 - 3x2
$48,000
Below you are given a partial Excel output based on a sample of 16 observations. ANOVA
df
SS
MS
F
Regression
4,853
2,426.5
Residual
485.3
Coefficients
Standard Error
Intercept
12.924
4.425
x1
-3.682
2.630
x2
45.216
12.560 The interpretation of the coefficient of x1 is that _____.
100% CORRECT ANSWERS!!
Compared to the confidence interval estimate for an average value of y (in a linear
regression model), the prediction interval estimate for a particular value of y will be _____.
Wider
In multiple regression, the critical region used for testing the significance of an individual
independent variable is located ______________________________.
in both tails of the distribution.
The difference between the observed value of the dependent variable and the value
predicted by using the estimated regression equation is the _____.
residual
The following are all assumptions on the error term in simple linear regression EXCEPT
error variance is non-constant
In a residual plot against x that does NOT suggest we should challenge the assumptions of
our regression model, we would expect to see a _____.
horizontal band of points centered near 0
A simple linear regression model has _____.
only one independent variable
The number of times each factor-level combination (treatment) is observed in a factorial
design is known as a(n) _____.
replication
If a blocking variable is needed, but not used, the variation from that source will be
expressed in the __________________________________________.
MSE
, In a simple linear regression analysis, if the slope is negative, then it must be true that
_____________________________________________.
there is a negative correlation between x and y
The following estimated regression model was developed relating yearly income (y in
$1000s) of 30 individuals with their age (x1) and their gender (x2) (0 if male and 1 if
female).
ŷ = 30 + 0.7x1 - 3x2
$48,000
Below you are given a partial Excel output based on a sample of 16 observations. ANOVA
df
SS
MS
F
Regression
4,853
2,426.5
Residual
485.3
Coefficients
Standard Error
Intercept
12.924
4.425
x1
-3.682
2.630
x2
45.216
12.560 The interpretation of the coefficient of x1 is that _____.
