Company A has a mean of 90 and a standard deviation of 20 Company B has a mean of 75 and a standard deviation of 30. Which company had less variation?

Company A because the standard deviation was lower

Company A because the mean was higher

Company B because the standard deviation was higher

Company B because the mean was lower

The questions on a multiple choice test each have 6 answer choices. Which model can be used to simulate randomly selecting the correct answer on a 20 question multiple choice test?

rolling a six-sided number cube 20 times

rolling a six-sided number cube 6 times

spinning a spinner with 4 equal sized sections 4 times

choosing 1 marble in a bag of 20 different colored marbles

Which is the best way to represent answering 25 multiple-choice questions with 4 choices for each answer?

spin a spinner with four sections 25 times

A certain brand of TV has a 50% chance of being defective. Which model could be used to determine the probability that when two TVs are chosen, they will both be defective?

spin a spinner with 4 equal sections

Samuel has 5 different colors of pens and 2 different colors of paper. Which model could be used to show how many different choices he has?

spin a spinner with 5 sections, then flip a coin

roll a die, then flip a coin 5 times

An ice cream parlor offers 15 different flavors of ice cream. Which model could be used to show how many different choices there are?

spin a spinner with 15 sections

A teacher wants to randomly choose 4 students to answer a series of questions. If there are 20 students in the classroom, describe a model that the teacher could use to simulate choosing these 4 students.

spinning a spinner with 20 sections 4 times

rolling a number cube and flipping a coin 20 times

A cereal company is placing one of 6 different tickets into its boxes of cereal. If each ticket is equally likely to appear in a box of cereal, which model could be used to simulate the tickets you would find in 50 boxes of cereal?

a number cube that is rolled 50 times

a coin that is flipped 50 times

a spinner that has 4 sections that is spun 50 times

a coin is flipped and a number cube is rolled 50 times

The population describes:

The group of people, objects or events being surveyed

part of the group being surveyed

Devon polled 642 drivers late on a Friday night. Is this a random sample of the drivers in the city?

No, because this only represents people late on a friday night

Yes because this represents all the drivers in the city well.

Data collected from a survey of American teenagers was used to estimate that 22% of teens believe in ghosts. This estimate was based on data from 600 American teenagers. What is the population that people carrying out the survey were interested in?

All people in the United States

The 600 teens that were surveyed.

The 22% of the teens surveyed who said they believe in ghosts.

Han and Priya want to know the mean height of the 35 students in their dance class. They each select a random sample of 6 students. The mean height for Han’s sample is 58 inches. The mean height for Priya’s sample is 61.5 inches. Does it surprise you that the two sample means are different? (may be more than one answer)

No, the means were pretty close

No, there were probably different students in each sample.

Yes, they should be the same since the population was the same

Yes, they should be the same since the sample was the same

Suppose you are interested in learning about how much time seventh grade students at your school spend outdoors on a typical school day. Select all the samples that are a part of the population you are interested in.

The 10 seventh graders on the school soccer team.

The 20 students in a seventh grade math class.

The first 20 students to arrive at school on a particular day.

The seventh grade students participating in a science fair put on by the four middle schools in a school district.

The students on the school debate team.

Ty wonders what proportion of students at his school would dye their hair red if their parents would let them. He surveyed a random sample of 15 students at his school, and 3 of them said they would. Kyle didn’t think Ty’s estimate was very accurate, so he surveyed a random sample of 150 students, and 15. of them said they would. Whose estimate is more accurate? Explain how you know.

Kyle since his sample was larger

Neither since they did not ask everyone

Both since their samples were random

The science and math teachers give daily homework. For a random sample of days throughout the year, the median number of science problems is 8 and the IQR is 3.1. For a random sample of days throughout the year, the median number of math problems is 12 and the IQR is 1.4. Which is more likely to be accurate? Explain your reasoning

The math estimate is more likely to be accurate since the IQR is less.

The science estimate is more likely to be accurate since they have less problems.

The mathestimate is more likely to be accurate since they have less problems

The science estimate is more likely to be accurate since the IQR is larger

Diego wants to survey a sample of students at his school to learn about the percentage of students who are satisfied with the food in the cafeteria. He decides to go to the cafeteria on a Tuesday and ask the first 35 students who purchase a lunch at the cafeteria if they are satisfied with the food. Do you think this is a good way for Diego to select his sample? Explain your reasoning. Select all that may apply.

No, students who are buying lunch at the cafeteria may be choosing to buy their lunch because they like the cafeteria food.

No, students who bring lunch from home won’t be included in the sample.

No, everyone does not get an equal chance of being asked.

Yes, his sample is large enough.

Yes, he will get some good information about the population he is interested in learning about.

Define representative sample.

a sample that has a distribution that closely resembles the population distribution in center, shape, and spread.

a sample that has a distribution that does not resemble the population distribution in center, shape, and spread.

True or False: A sample with the same mean as the population is representative of the population. Explain.

False, it may miss other important aspects of the population.

False, it needs to also represent the population in measures of spread and center, etc.

True, all that matters is having the same mean.

Lin is running in an election to be president of the seventh grade. She wants to predict her chances of winning. Which of the following ideas for surveying a sample of the students will give her a representative sample?

Put all the 7th grade names in a bag and pick 40 students and ask them who they will vote for

Ask every fifth person in each of the 7th grade homerooms who they are voting for

Ask everyone on her basketball team who they are voting for.

Ask the first 15 students to arrive at school one morning who they are voting for

Unit 8 Test Review

Authored by Kimberly ApexFriendshipMS

Mathematics

7th Grade

CCSS covered

Used 16+ times

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52 questions

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the Q1 of this data set?
6, 7, 2, 1, 5, 2, 1, 6

1.5

2.5

Tags

CCSS.6.SP.B.5

CCSS.6.SP.A.2

CCSS.6.SP.A.3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the Q3 of this data set?
6, 7, 2, 1, 5, 2, 1, 6

5.5

6.5

Tags

CCSS.7.SP.B.4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following lists all parts of the five number summary?

Mean, Median, Mode, Range, and Total

Minimum, Quartile 1, Median, Quartile 3, and Maximum

Smallest, Q1, Q2, Q3, and Q4

Minimum, Maximum, Range, Mean, and Median

Tags

CCSS.7.EE.B.3

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is Roger's median score?

127

155

156

193

Tags

CCSS.6.SP.B.5

CCSS.6.SP.A.2

CCSS.6.SP.A.3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is another word for average?

Mean

Median

Mode

Range

Tags

CCSS.7.EE.B.3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the interquartile range?

Tags

CCSS.6.SP.B.5

CCSS.6.SP.A.2

CCSS.6.SP.A.3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What data value is the upper quartile?

Tags

CCSS.6.SP.B.5

CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.A.1

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Unit 8 Test Review

What is the Q1 of this data set?
6, 7, 2, 1, 5, 2, 1, 6

What is the Q3 of this data set?
6, 7, 2, 1, 5, 2, 1, 6

Which of the following lists all parts of the five number summary?