Unit Test — Unit test Answers — West

1

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The table shows the number of calories in four meals and the cost of each meal.

A

a weak positive correlation

B

a strong positive correlation

C

a weak negative correlation

D

a strong negative correlation

2

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The table shows the number of flowers in four bouquets and the total cost of each bouquet.

A

–0.57

B

–0.28

C

0.28

D

0.57

3

Melissa collected the data in the table.

A

–3

B

–1

C

1

D

3

4

Which graph shows a negative correlation?

A

A graph with both axes unnumbered. Points show a steady trend.

B

A graph with both axes unnumbered. Points are scattered loosely in the top half of the graph.

C

A graph with both axes unnumbered. Points show a downward trend.

D

A graph with both axes unnumbered. Points are scattered loosely all Over graph.

5

A data set is shown in the table. The line of best fit modeling the data is y = 2.69x – 7.95.

A

–0.88

B

–0.12

C

0.12

D

0.88

6

Ms. Sutton recorded the word counts and scores of the top ten essays in a timed writing contest. The table shows her data.How does the word count of an essay relate to its score in the contest?

A

Word count tends to decrease as the score decreases.

B

Word count tends to increase as the score decreases.

C

Word count tends to remain constant as the score decreases.

D

Word count has no apparent relationship to the score of the essay.

7

Georgianna wants to use the linear model associated with the data in the table to make a prediction.

A

0 to 5 minutes

B

0 to 18 minutes

C

0 to 30 minutes

D

18 to 30 minutes

8

Scientists studied a deer population for 10 years. They generated the function f(x) = 248(1.15)x to approximate the number of deer in the population x years after beginning the study. About how many deer are in the population 3 years after beginning the study?

A

251

B

377

C

856

D

1,003

9

Which phrases describe the relationship between heart rate and daily intake of caffeine? Select two options.

A

negative correlation

B

increasing heart rate

C

constant correlation

D

positive correlation

E

decreasing heart rate

10

The graph shows the best-fit regression model for a set of data comparing the number of hours spent hiking and the number of miles traveled in one day.

A

Each point in the data set falls on the regression line.

B

The regression model is an accurate representation of the distance for any number of hours hiked.

C

Each point in the data set is near the regression line.

D

The regression model is inaccurate, as it does not begin at (0, 0).

11

A 2-column table with 4 rows. The first column is labeled x with entries 0, 1, 4, 5. The second column is labeled y with entries 0, 1, 4, 5.

A

0

B

1

C

4

D

5

12

The chart represents a data set’s given values, predicted values (using a line of best fit for the data), and residual values.

A

g = 2 and h = –1

B

g = 28 and h = 39

C

g = –2 and h = 1

D

g = –28 and h = –39

13

The table shows the estimated number of lines of code written by computer programmers per hour when x people are working.

A

y = 47(1.191)x

B

y = 34(1.204)x

C

y = 26.9x – 1.3

D

y = 27x – 4

14

The scatterplot represents the total fee for hours renting a bike. The line of best fit for the data is y = 6.855x + 10.215.Which table shows the correct residual values for the data set?

A

A 3-column table with 5 rows. The first column is labeled x with entries 1, 2, 3, 4, 5. The second column is labeled given with entries 14.95, 25.50, 32, 38.95, 42.50. The third column is labeled residual value with entries negative 2.12, 1.575, 1.22, 1.315, negative 1.99.

B

A 3-column table with 5 rows. The first column is labeled x with entries 1, 2, 3, 4, 5. The second column is labeled given with entries 14.95, 25.50, 32, 38.95, 42.50. The third column is labeled residual value with entries 2.12, negative 1.575, negative 1.22, negative 1.315, 1.99.

C

A 3-column table with 5 rows. The first column is labeled x with entries 1, 2, 3, 4, 5. The second column is labeled given with entries 14.95, 25.50, 32, 38.95, 42.50. The third column is labeled residual value with entries 2.12, negative 1.575, 1.22, negative 1.315, 1.99.

D

A 3-column table with 5 rows. The first column is labeled x with entries 1, 2, 3, 4, 5. The second column is labeled given with entries 14.95, 25.50, 32, 38.95, 42.50. The third column is labeled residual value with entries negative 2.12, 1.575, negative 1.22, 1.315, negative 1.99.

15

Which graph shows data whose r-value is most likely closest to 1?

A

A graph shows both axes unnumbered. Points show a downward trend.

B

A graph shows both axes unnumbered. Points show an upward trend.

C

A graph shows both axes unnumbered. Points show a downward trend.

D

A graph shows both axes unnumbered. Points are scattered all over the graph.

16

Melinda works at a cafe. Each day that she works, she records x, the total dollar amount of her customers’ bills and then y, her total daily wages. The table shows her data for 2 weeks.

A

$18

B

$26

C

$36

D

$40

17

The graph and table shows the relationship between y, the number of words Jean has typed for her essay and x, the number of minutes she has been typing on the computer.

A

2,500

B

2,750

C

3,000

D

3,250

18

A line of best fit is f(x) ≈ −0.86x + 13.5 for the set of points in the table.

A

−5

B

−2

C

3

D

12

19

Rob is investigating the effects of font size on the number of words that fit on a page. He changes the font size on an essay and records the number of words on one page of the essay. The table shows his data.Which equation represents the approximate line of best fit for data, where x represents font size and y represents the number of words on one page?

A

y = –55x + 407

B

y = –41x + 814

C

y = –38x + 922

D

y = –26x + 723

20

Raquel throws darts at a coordinate grid centered at the origin. Her goal is to create a line of darts. Her darts actually hit the coordinate grid at (–5, 0), (1, –3), (4, 5), (–8, –6), (0, 2), and (9, 6). Which equation best approximates the line of best fit of the darts?

A

y = 0.6x + 0.6

B

y = 0.1x + 0.8

C

y = 0.8x + 0.1

D

y = 0.5x + 0.6

Unit Test — Unit test Answers

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