7/10/19, 9(01 PM
Chapter 7.1 - 7.3 Quiz
Page 1 of 13
Dashboard
/
My courses
/
Summer 2019 ISDS 361B-06 10247
/
July 8 - July 14
/
Chapter 7.1 - 7.3 Quiz
Started on
Wednesday, July 10, 2019, 6J55 PM
State
Finished
Completed on
Wednesday, July 10, 2019, 9J01 PM
Time taken
2 hours 5 mins
Points
18.00/18.00
Grade
1.29
out of 1.29 (
100
%)
Question
1
Correct
1.00 points out of 1.00
When the mean value of the response variable is independent of variation in the predictor variable, the slope of the regression
line is
Select one:
a. zero
!
b. negative
c. positive
d. infinite
Your answer is correct.
When the mean value of the response variable is independent of the variation in the predictor variable, the slope of the
regression line is zero. See Section 7.1, The Simple Linear Regression Model, page 297.

7/10/19, 9(01 PM
Chapter 7.1 - 7.3 Quiz
Page 2 of 13
Question
2
Correct
1.00 points out of 1.00
Question
3
Correct
1.00 points out of 1.00
The coefficient of determination
Select one:
a. is used to measure the slope of the estimated regression line.
b. can be any positive number.
c. is interpreted as the percent of the variation in the values of
x
that are explained by the estimated regression line.
d. is defined as SSR/SST.
!
Your answer is correct.
The coefficient of determination is defined as SSR/SST. The coefficient of determination must be a number between 0 and 1. It is
not used to measure the slope of the estimated regression line and is interpreted as the percent of the variation in the values of
y
that are explained by the estimated regression line. See Section 7.3, Assessing the Fit of the Simple Linear Regression Model,
page 308.
What would be the coefficient of determination if the total sum of squares (SST) is 30 and the sum of squares due to regression
(SSR) is 27?
Select one:
a. 0.40
b. 0.80
c. 0.90
!
d. 0.30
Your answer is correct.
The coefficient of determination = SSR/SST = 27/30 = 0.9. See Section 7.3, Assessing the Fit of the Simple Linear Regression
Model, page 308

7/10/19, 9(01 PM
Chapter 7.1 - 7.3 Quiz
Page 3 of 13
Question
4
Correct
1.00 points out of 1.00
Question
5
Correct
1.00 points out of 1.00
The difference between the observed value of the dependent variable and the value predicted using the estimated regression
equation is known as the
Select one:
a. residual
!

#### You've reached the end of your free preview.

Want to read all 13 pages?

- Fall '15
- Dr.T.Drezner