12 General Unit 3 Topic 1 (2)  2020

12 General Unit 3 Topic 1 (2) 2020

12th Grade

17 Qs

quiz-placeholder

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12 General Unit 3 Topic 1 (2)  2020

12 General Unit 3 Topic 1 (2) 2020

Assessment

Quiz

Mathematics

12th Grade

Hard

Created by

Liliane WISSA

Used 54+ times

FREE Resource

17 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

When using a least squares regression line to model a relationship displayed in a scatterplot, one key assumption is that:

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

Media Image

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

Media Image

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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