the elevation (in thousands of feet) for an archaeological site in the
southwestern United States. Let
y
be the percentage of unidentified artifacts
(no specific cultural affiliation) at a given elevation. Suppose that the
following data were obtained for a collection of archaeological sites in New
Mexico:
Given that
and
what
percentage of the variation in
y
can be
explained
by the corresponding
variation in
x
and the least-squares line?
1.5%
87.8%
5.2%
You Answered
You Answered
77.1%
Correct Answer
Correct Answer
12.2%
1 / 1 pts
Question 8
It is thought that prehistoric Indians did not take their best tools, pottery, and
household items when they visited higher elevations for their summer camps.
It is hypothesized that archaeological sites tend to lose their cultural identity
and specific cultural affiliation as the elevation of the site increases. Let
x
be
the elevation (in thousands of feet) for an archaeological site in the
southwestern United States. Let
y
be the percentage of unidentified artifacts
(no specific cultural affiliation) at a given elevation. Suppose that the

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11/8/19, 2(22 PM
Chapter 9 Graded Homework: FA19 MATH-140-5118 Introduction to Statistics -HYBRID-
Page 9 of 14
following data were obtained for a collection of archaeological sites in New
Mexico:
Given that
and
should a least squares line be used for
predictions?
Since about 59.2% of the behavior of the
y
variable can be explained by the
corresponding behavior of the
x
variable if we use the equation of the least-
squares line, the line should be used for predictions.
Since about 35.0% of the behavior of the
y
variable can be explained by the
corresponding behavior of the
x
variable if we use the equation of the least-
squares line, the line should not be used for predictions.
Correct!
Correct!
Since about 59.2% of the behavior of the
y
variable can be explained by the
corresponding behavior of the
x
variable if we use the equation of the least-
squares line, the line should not be used for predictions.
Since about 40.8% of the behavior of the
y
variable can be explained by the
corresponding behavior of the
x
variable if we use the equation of the least-
squares line, the line should be used for predictions.
Since about 40.8% of the behavior of the
y
variable can be explained by the
corresponding behavior of the
x
variable if we use the equation of the least-
squares line, the line should not be used for predictions.
0 / 1 pts
Question 9

11/8/19, 2(22 PM
Chapter 9 Graded Homework: FA19 MATH-140-5118 Introduction to Statistics -HYBRID-
Page 10 of 14
It is thought that prehistoric Indians did not take their best tools, pottery, and
household items when they visited higher elevations for their summer camps.

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- Fall '19