Question 1
0 out of 1 points
Incorrect
If the area to the left of x is 0.012, then what is the area to the right? (answer to the nearest thousandth)
Selected Answer:
0.013
Response Feedback:
1 0.012 = 0.988
Question 2
0.5 out of 1 points
Partial Credit
Th
Instructor's Note:
This unit will define various terms that you may not be familiar with. You will also learn to explain the
differences between quantitative and qualitative data, apply key concepts such as mean, median and
mode, and summarize and interpr
Chapter 13: Multiple regression
1. Which is not a standard criterion for assessing a multiple regression model?
a) Logic of causation
b) Overall fit
c) Degree of collinearity
d) Binary predictors
Chapter 12: Simple Regression
4. If the attendance at a baseball game is to be predicted by the equation Attendance = 16,500 - 75
Temperature, what would be the predicted attendance if Temperature is 90 degrees?
a) 6,750
b) 9,750
c) 12,250
Y = 16,500 75(9
Chapter 12: Simple Regression
1. A news network stated that a study had found a positive correlation between the number of
children a worker has and his or her earnings last year. You may conclude that:
a) People should have more children so they can get
Chapter 12: Simple Regression
5. Which of the following is not a characteristic of the F-test in a simple regression?
a) It is a test for overall fit of the model.
b) The test statistic can never be negative.
c) The F-test gives a different p-value than t
Chapter 12: Simple Regression
2. Which of the following statements is incorrect?
a) A scatter plot is used to visualize the association (or lack of association) between two
quantitative variables.
b) The correlation coefficient r measures the strength of
Chapter 12 Simple Regression
8. When homoscedasticity exists, we expect that a plot of the residuals versus the fitted Y:
a) Will form approximately a straight line.
b) Crosses the centerline too many times.
c) Will show no pattern at all.
Chapter 12 Simple Regression
7. In a simple regression, which would suggest a significant relationship between X and Y?
a)
b)
c)
d)
Large p-value for the estimated slope
Largest statistic for the slope
Large p-value for the F statistic
Small t-statistic f
Chapter 12 Simple Regression
For the following simple regression output, answer the following questions (below).
Regression Statistics
Multiple R
R Square
Adjusted R Square
Standard Error
Observations
ANOVA
0.371
0.1377
0.1293
43.95467488
105
Intercept
Si
Chapter 12: Simple Regression
6. The standardized residual ei = -2.205 indicates:
a) A rather poor prediction.
b) An extreme outlier in the residuals.
c) A likely data entry error.
Nermeen Elmorabea
Homework Chapter 9 (2, 4,11, 12, 14, 19)
9.2
1
1
a) H should be p = 2 and H should be p 2 .
The test is two-sided because we will reject the hypothesis of a fair coin either if
very many or very few heads come up.
b)The P-value is
P-valu
Nermeen Elmorabea
Homework Chapter 7 (7, 12, 13, 16, 18, 22)
7.7
(a) The observed test statistic is
Z=
xx 6075860,000
=
/ n
1500/ 16
=2.021
Since this is a I-sided test, the P-value is
P = [1 - (z)] = [ 1 - (2.021) ]= [ 1 - 0.9783] = 0.022
The conclusion
Nermeen Elmorabea
Homework Chapter 8 (9, 11,16, 18 )
8.9
a)
Here, = 0.05. The two-sided confidence interval has ends
(n 11) s +(n 1) s
=
n +n 2
( 211 ) 4.5+ ( 211 ) 2
=
21+212
( 211 ) 4.5+ ( 211 ) 2
= 3.25
40
Then a 95% CI for - is given by
1
n
(XX yX )