AnswersMath 7 B M12 2526 S2Comparing Box Plots

Comparing Box Plots — Unit test Answers

25 verified answers1 views
1
Free Preview

The box plots show the weights, in pounds, of the dogs in two different animal shelters.One-half of the dogs in each shelter are between which weights?

Question illustration
A
between 8 and 30 pounds in shelter A; between 10 and 28 pounds in shelter B
B
between 8 and 17 pounds in shelter A; between 10 and 16 pounds in shelter B
C
between 21 and 30 pounds in shelter A; between 18 and 28 pounds in shelter B
D
between 28 and 30 pounds in shelter A; between 20 and 28 pounds in shelter B
2
Free Preview

Chin researched the amount of money 150 students earned per month from jobs held during the summer. He created a table of six sample means from his collected data. Sample NumberSample Mean ($)120822353245420752056210Using his results, what is a valid prediction about the mean of the population?

A
The predicted mean of the population will be less than 200.
B
The predicted mean of the population will be less than 245.
C
The predicted mean of the population will be more than 275.
D
The predicted mean of the population will be more than 250.
3

A researcher wants to develop a product for families who have small children. He needs to determine if there is a nationwide interest in a toy that will help children describe their emotions. He asks only a sample of the population to complete his survey. What should be true of the sample so that the results of the survey can be used to predict the results of surveying the population?

A
The size of the sample should be the same size as the population.
B
The families included in the sample should represent the families in the population.
C
The families included in the sample cannot be included in the population.
D
The size of the sample should be larger than the size of the population.
4

The dot plots show the heights of boys and girls at a summer camp. Heights of Boys and Girls at CampWhich is a true statement for most of the data in each plot?

Question illustration
A
Most of the data in each plot are greater than 48.
B
Most of the data in each plot are less than 48.
C
Most of the data in each plot are around 52.
D
Most of the data in each plot are around 54.
5

The box plots show the average speeds, in miles per hour, for the race cars in two different races.Average Speeds of Cars in Race AAverage Speeds of Cars in Race BWhich correctly describes the consistency of the speeds of the cars in the two races?

Question illustration
A
The speeds in race A are likely to be near 170 mph and the speeds in race B are likely to be near to 165 mph.
B
The speeds in race A are likely to be near 153 mph and the speeds in race B are likely to be near to 145 mph.
C
The speeds in race A are likely to be near 120 mph and the speeds in race B are likely to be near to 125 mph.
D
The speeds in race A are likely to be near 145 mph and the speeds in race B are likely to be near to 153 mph.
6

Scientists are studying hurricanes to determine the number of hurricanes in the past 50 years that have caused greater than $1 million in damages. Which best describes the population?

A
hurricanes
B
hurricanes that caused greater than $1 million in damages
C
scientists
D
scientists participating in the research
7

The dot plots below show rainfall totals in the Highlands and Lowlands areas of a certain region.When comparing the two sets of data, which is a true statement?

Question illustration
A
There are gaps in both sets of data.
B
The ranges are the same.
C
The two sets of data do not overlap.
D
The rainfall peaks at a lower value in the Lowlands.
8

The means and mean absolute deviations of Sidney’s and Phil’s grades are shown in the table below.Means and Mean Absolute Deviations of Sidney’s and Phil’s Grades SidneyPhilMean8278Mean Absolute Deviation3.283.96Which expression represents the ratio of the difference of the two means to Sidney’s mean absolute deviation?

A
StartFraction 82 over 3.28 EndFraction
Option A
B
StartFraction 4 over 3.28 EndFraction
Option B
C
StartFraction 4 over 0.68 EndFraction
Option C
D
StartFraction 82 over 0.68 EndFraction
Option D
9

Liliana wants to start a seventh-grade computer club at Hamden Middle School. She surveyed 20 seventh-grade students at the town park. She asked each student how many hours they spend on their computers each week. She obtained the following results.8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21What is the ratio of the total number of students who used their computers to the total number of students surveyed?

A
or
Option A
B
or
Option B
C
or
Option C
D
or
Option D
10

Two months ago, the mean daily rainfall in a local city was 9.4 cm. The mean absolute deviation was 3.5 cm. Last month, the mean daily rainfall in that city was 11.5 cm, and the mean absolute deviation was 1.6 cm.Which statement about the rainfall is true?

A
More rain fell two months ago than last month.
B
About the same amount of rain fell two months ago as last month.
C
Last month, the amount of rain that fell each day varied about the same as the month before.
D
Last month, the amount of rain that fell each day varied less than the month before.
11

Ms. Sanchez’s students were asked how many hours they spend participating in organized sports each week. Each row of the table represents one sample from the class. Number of Hours Playing Sports55306224523430140436What is the mean of the sample in the third row?

A
2.2
B
2.8
C
3.0
D
3.4
12

Which statement illustrates a simulation that could be used to generate samples of people on a game show selecting either door A, door B, or door C?

A
Flipping a coin and getting heads for door A or tails for door C.
B
Rolling a die; 1 or 2 represents door A, 3 or 4 represents door B, and 5 or 6 represents door C.
C
Creating a spinner divided into 4 equal parts. Label two parts door A, one part door B, and the third part door C.
D
Go to the game show and collect data for a month on which doors people chose.
13

School newspaper staff went to three different sports games to survey students on their favorite sport, and the results are shown in the table below. Are these samples biased? Why or why not?Favorite Sport SurveySample 1Sample 2Sample 3Basketball23Basketball1Basketball1Football2Football24Football2Volleyball0Volleyball0Volleyball22

A
These samples are not biased because students like different sports and the samples reflect the different opinions.
B
These samples are biased because the newspaper staff went to a basketball game, football game, and volleyball match to interview the students.
C
These samples are not biased because each has a total of 25 students, which makes them equal.
D
These samples are biased because 0 should never appear in a sample as it is not possible.
14

When Henry surveyed 45 seventh-grade students at random in the school cafeteria, he found that 3 out of 15 liked reggae music. Using proportional reasoning, about how many of the 180 seventh-grade students in his school like reggae?

A
About 12 seventh-grade students like reggae music.
B
About 36 seventh-grade students like reggae music.
C
About 60 seventh-grade students like reggae music.
D
About 108 seventh-grade students like reggae music.
15

A scientist is studying tulips and daffodils. The scientist estimates that there are 150 tulips in the population of 600 tulips and daffodils. He chooses flowers from random parts of the garden to study. Which best explains how he can choose a random sample of flowers to represent the population?

A
He can choose 50 flowers.
B
He can choose 25 tulips and 25 daffodils.
C
He can choose 15 tulips and 60 daffodils.
D
He can choose 10 tulips and 30 daffodils.
16

A random sample of people is chosen to participate in a survey. For the survey results to be considered valid, which must be true of the random sample?

A
The sample must be the same size as the population.
B
The sample must represent the target population.
C
The sample must be biased.
D
The sample must be a group separate from the population.
17

Mr. Sanchez surveyed classes to aid in planning the end-of-year party. For the first sample, Mr. Sanchez surveyed every third person on each first-period class roster. For the second sample, Mr. Sanchez surveyed his five honors math classes. Which statement about Mr. Sanchez’s samples is true?End-of-Year Party SurveySample 1Sample 2Water Park21Water Park36Bowling/Arcade36Bowling/Arcade28Zoo16Zoo24Dance & Dinner27Dance & Dinner12

A
Sample 1 is biased.
B
Sample 2 is biased.
C
Both samples are biased.
D
Neither sample is biased.
18

Jillian and Dawn are playing a game of miniature golf. In this game, the score on a hole is the number of putts it takes to get the ball into the hole. The winner is the player with the lowest score. After playing 18 holes, Jillian’s mean is 2.4 and Dawn’s mean is 3.3. Which explains who won the game?

A
Jillian won the game because her score varied less than Dawn’s score.
B
Jillian won the game because the person with the lower mean took fewer putts on average for each hole.
C
Dawn won the game because the person with the greater mean played better.
D
Dawn won the game because her mean absolute deviation was less than Jillian’s.
19

Myra polled twenty-five students in her class to determine the number of movies the students attended at the theater this year. The results are in the table. She decided to find the mean of a sample using Row 1 and Row 5.Number of Movies AttendedRow 165286Row 220452Row 334301Row 452633Row 523224What is the mean of her sample?

A
2
B
4
C
6
D
8
20

The box plots show Theo’s math scores and language arts scores.MathLanguage ArtsAbout 50% of Theo’s scores are in which range for each subject?

Question illustration
A
60 to 85 for math; 60 to 80 for language arts
B
55 to 90 for math; 50 to 90 for language arts
C
55 to 60 for math; 50 to 60 for language arts
D
85 to 90 for math; 80 to 90 for language arts

Did you find these answers helpful?

More from this Course

Quiz
23 verified answers

Unit Test

Quiz
25 verified answers

Unit Test

Quiz
25 verified answers

Unit Test