When using a least squares regression line to model a relationship displayed in a scatterplot, one key assumption is that:
12 General Unit 3 Topic 1 (2) 2020

Quiz
•
Mathematics
•
12th Grade
•
Hard

Liliane WISSA
Used 54+ times
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17 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
there are two variables
the variables are related
the variables are linearly related
r2 > 0.5
the correlation coefficient is positive
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
In the least squares regression line y = −1.2 + 0.52x:
the y-intercept = −0.52 and slope = −1.2
the y-intercept = 0 and slope = −1.2
the y-intercept = 0.52 and slope = −1.2
the y-intercept = −1.2 and slope = 0.52
the y-intercept = 1.2 and slope = −0.52
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
If the equation of a least squares regression line is
y = 8 − 9x and R2 = 0.25:
r = −0.5
r = −0.25
r = −0.0625
r = 0.25
r = 0.50
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The least squares regression line y = 8 − 9x predicts that, when x = 5, the value of y is:
−45
−37
37
45
53
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A least squares regression line of the form
y = a + bx is fitted to the data set shown.
The equation of the line is:
y = −0.69 + 24.4x
y = 24.4 − 0.69x
C y = 24.4 + 0.69x
y = 28.7 − x
y = 28.7 + x
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A least squares regression line of the form y = a + bx is fitted to the data set shown.
The equation of the line is:
y = 1 + 0.5x
y = 0.5 + x
y = 0.5 + 7.5x
y = 7.5 + 0.5x
y = 30 − 0.5x
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Given that r = 0.733, sx = 1.871 and sy = 3.391, the slope of the least squares regression line is closest to:
0.41
0.45
1.33
1.87
2.49
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