Unit 5 Test Review: Two-Variable Statistics

Unit 5 Test Review: Two-Variable Statistics

9th Grade

10 Qs

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Unit 5 Test Review: Two-Variable Statistics

Unit 5 Test Review: Two-Variable Statistics

Assessment

Quiz

Mathematics

9th Grade

Practice Problem

Medium

CCSS
HSF.LE.B.5, 8.EE.C.8C

Standards-aligned

Created by

Suzann Wagstaff

Used 1+ times

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10 questions

Show all answers

1.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Media Image

Thirteen young adults kept track of how many hours they worked at a restaurant and how many texts they sent during their shift. The equation of the line of best fit is: y = 9.15x + 66.23. The correlation coefficient for the data is r = -0.859. Which statements about the scenario are true?

Select all that apply.

The value of the correlation coefficient is very close to -1, so there is no association between the number of hours worked and the number of texts sent.

The line of best fit indicates, in general, the number of texts sent, on average, about 9 less for every hour that is worked.

If the linear trend holds, the number of texts sent would be 0 for someone who has worked 8,274 hours in a shift.

The number of texts sent during a shift tends to decrease as the number of hours increases.

Tags

CCSS.HSF.LE.B.5

2.

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of the following statements indicates a weak negative correlation?

It is reasonable to assume a correlation coefficient is around -0.3 for the scenario.

The slope of the line of best fit for the scenario will be close to 1.

The correlation coefficient will be closer to -1 than it is to 0.

The slope of the line of best fit for the related scatterplot will be negative.

3.

MATCH QUESTION

3 mins • 1 pt

Media Image

A researcher surveyed 100 people who brushed their teeth every day. He asked them if they flossed and/or used mouthwash. The results are shown below in the table.

Based on the information provided in the table, match each description on the left to its corresponding relative frequency on the right.

25%

What percentage of people did not floss?

18%

Of the people who reported not flossing, what percentage used mouthwash?

55%

Of the people who used mouth wash, what percentage reported flossing?

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Three residual plots shown below are all for lines of best fit to the same data.

Which residual plot is most likely to be from comparing the data to the line of best fit?

Plot A

Plot B

Plot C

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Actual data creates the point (6, 7.8) on a scatterplot.

The equation of the line best fit for the data estimates that y is 8.6 when x is 6.

What is the residual for the point (6, 7.8)?

-0.8

8

-6.7

1.8

Tags

CCSS.8.EE.C.8C

6.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Of the correlation coefficients below, which is most likely describing two variables that have no relationship?

r = -0.95

r = 0.01

r = 0.39

r = -0.68

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Order the following correlation coefficients from the weakest correlation to the strongest correlation.

0.76, -0.28, -0.94, 0.55

-0.28, 0.55, 0.76, -0.94

-0.94, 0.76, 0.55, -0.28

0.55, 0.76, -0.28, -0.94

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