Solving Quadratic Equations: Square Root…

1

Free Preview

Alejandro wants to determine the average shoe size of all of the male students in his school. Which sample is likely to yield the most biased results?

A

every tenth boy on the school’s phone list

B

every member of the boys’ basketball team

C

every boy in a randomly selected ninth-, tenth-, eleventh-, and twelfth-grade gym class

D

every fifth boy who walks through the front doors of the school in the morning

2

Free Preview

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

3

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.

4

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

5

The residents of three towns were polled to find the percentage of residents who take a vacation in the summer or in the winter. Which is the joint relative frequency of those in Town 2 who take a summer vacation? Round the answer to the nearest percent.

A

7%

B

10%

C

25%

D

75%

6

Nico wanted to determine the number of students in his school who buy school lunch. He walked around the cafeteria one lunch period looking to see whether every fifth person in the cafeteria purchased lunch or brought their own.

A

survey

B

simulation

C

experiment

D

observational study

7

The two-way frequency table represents data from a survey asking mall visitors whether they like seafood, meat, or both. Which is the joint relative frequency for mall visitors who like seafood and meat?

A

StartFraction 5 Over 72 EndFraction

B

StartFraction 16 Over 72 EndFraction

C

StartFraction 20 Over 72 EndFraction

D

StartFraction 31 Over 72 EndFraction

8

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).

9

Melissa collected the data in the table.

A

–3

B

–1

C

1

D

3

10

Violet creates two spinners for a game. Each spinner is spun once, and the sum is recorded. The table represents the sums of the spinners and the frequency of each sum.

A

The mean is 12.

B

The mean is 16.

C

The mean is the same as the median.

D

The mean is the same as the range.

11

The dot plot shows the number of words students spelled correctly on a pre-test.

A

The graph is skewed right.

B

The graph is nearly symmetrical.

C

The graph is skewed left.

D

The graph is perfectly symmetrical.

12

Which value for R in the table would most likely indicate an association between the conditional variables?

A

0.09

B

0.10

C

0.13

D

0.79

13

Which could be a conditional relative frequency table?

A

A 4-column table with 3 rows. The first column has no label with entries C, D, total. The second column is labeled A with entries 0.25, 0.25, 0.50. The third column is labeled B with entries 0.25, 0.25, 0.50. The fourth column is labeled total with entries 0.50, 0.50, 1.0.

B

A 4-column table with 3 rows. The first column has no label with entries C, D, total. The second column is labeled A with entries 0.25, 0.35, 0.30. The third column is labeled B with entries 0.75, 0.65, 0.70. The fourth column is labeled total with entries 1.0, 1.0, 1.0.

C

A 4-column table with 3 rows. The first column has no label with entries C, D, total. The second column is labeled A with entries 0.75, 0.25, 0.50. The third column is labeled B with entries 0.25, 0.75, 0.50. The fourth column is labeled total with entries 0.50, 0.50, 1.0.

D

A 4-column table with 3 rows. The first column has no label with entries C, D, total. The second column is labeled A with entries 0.65, 0.35, 1.0. The third column is labeled B with entries 0.35, 0.65, 1.0. The fourth column is labeled total with entries 1.0, 1.0, 1.0.

14

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

15

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

16

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

17

Ms. Johnson uses a statistics program to analyze all the data collected by her students during a lab experiment about acceleration due to gravity. The program reports =31.5 and .What is the variance of the data? Round to the nearest tenth.

A

1.6

B

2.5

C

5.6

D

6.3

18

The graph shows the distribution of hand lengths, in centimeters, of the members of an orchestra.

A

1

B

2

C

4

D

5

19

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

20

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.

Solving Quadratic Equations: Square Root Property — Unit test Answers

More from this Course

TRY EDGENUITY HACKS