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Note from the author:

Populations and Samples; Scatter plots

1

1 pt

Carlos is at a local car dealership on Saturday between the hours of 8:00 am and 10:00 am to survey people on the most popular car.

Is Carlos's sample biased or unbiased?

Drag the description below to the correct category.

- Biased SampleAnswer by dragging items here
- Unbiased SampleAnswer by dragging items here

2

1 pt

Susan wants to know the favorite sport of students in her class.

- Biased SampleAnswer by dragging items here
- Unbiased SampleAnswer by dragging items here

3

1 pt

Leslie wants to determine eating habits of people in her neighborhood.

- Biased SampleAnswer by dragging items here
- Unbiased SampleAnswer by dragging items here

4

1 pt

Mary wants to determine the amount of time that 7th graders spend studying for their math exam.

- Biased SampleAnswer by dragging items here
- Unbiased SampleAnswer by dragging items here

5

1 pt

David wants to find out the favorite sport of boys in his school.

- Biased SampleAnswer by dragging items here
- Unbiased SampleAnswer by dragging items here

6

1 pt

An unbiased sample is: (check all that apply)

representative of the population

not fair

selected at random

large enough to make informed decisions

7

1 pt

A biased sample is one that does not fairly represent the population.

True

False

8

1 pt

random sample - a sample in which each individual or object in the entire population does not have an equal chance of being selected.

True

False

9

1 pt

A sample is part of a population.

True

False

10

10 pts

Read the scenarios below.

Use the scenarios to categorize which choices best represent a population and which choices best represent a sample.

*A beverage company wants to see if people in the United States like their new logo.

*A famous rockband wants to see what what people, who bought their last album, think of their songs.

*Before a nation wide election, a polling place was trying to see who would win.

*A store owner wants to survey customers about their favorite toy.

*A mayor wants to see if the people in his town think he is doing a good job.

Drag the choices below to the correct category.

Does it represent a population or a sample?

- PopulationAnswer by dragging items here
- SampleAnswer by dragging items here

11

1 pt

Students in two homeroom classes were surveyed to find out their favorite foods.

Results are shown in the table below.

Answer the questions on your own paper. Then type in the answers to questions 12-15 below.

Table Link

12

1 pt

Use the table link in #11 to answer this question. In your answer, type only the number.

What percent of the students prefer ice cream as their favorite?

13

1 pt

Use the table link in #11 to answer this question. In your answer, type only the number.

What percent did not prefer pizza as their favorite?

14

1 pt

Use the table link in #11 to answer this question.

What percent prefer pizza or cheeseburger as their favorite?

15

1 pt

Use the table link in #11 to answer this question.

If there are 1170 students in the school, how many would you expect to choose potato chips as their favorite food?

16

1 pt

In a sample of voters in Harrisburg, 18 out of 25 favored creating a new shopping center. If 50,000 people vote in the next Harrisburg election, how many are likely to vote in favor of the new shopping center based on this sample?

17

1 pt

Suppose 2/7 of students in your homeroom class wore shorts to school today. How many students would you have to survey randomly, on average, in order to get 14 students who wore shorts to school?

18

1 pt

In a sample of people in the school district, 16 out of 25 favored building a new football stadium. If 6,000 people vote in the next local election, how many are likely to vote in favor of the new football stadium based on this sample?

19

1 pt

A candidate for student council wants to poll students to see how well his campaign is going. What collection method should he use to gather his information?

Polling random students in the library

Posting signs around school asking people to call him to voice their opinion

Polling every 5th student to enter the building in the morning

20

1 pt

In a recent poll to measure Hugo's progress in his election campaign, 74 out of 150 people in the random sampling support him in his efforts. What is the best conclusion based on the polls?

Hugo is in a close race

Hugo is going to win the election

Hugo is going to lose the election

21

1 pt

Describe the trend in the scatter plot. Click on the Link to see it.

#21 Scatterplot

positive

negative

no correlation

22

1 pt

Describe the trend in the scatter plot. Click on the Link to see it.

#22 Scatterplot

positive

negative

no correlation

23

1 pt

Describe the trend in the scatter plot. Click on the Link to see it.

#23 Scatterplot

positive

negative

no correlation

24

1 pt

Describe the trend in the scatter plot. Click on the Link to see it.

#24 Scatterplot

positive

negative

no correlation

25

1 pt

Describe the trend in the scatter plot. Click on the Link to see it.

#25 Scatterplot

positive

negative

no correlation

26

1 pt

Graph the data table below in a scatterplot.

Each column represents a point on the scatter plot.

The x axis represents the number of books.

The y axis represents the weight of the books.

Data Table Link

27

1 pt

Look at the scatterplot graph you made for question #26.

Describe the trend in your scatter plot

positive

no trend

negative

28

1 pt

Identify the data set as having a positive, a negative, or no correlation.

#28 a person's height and the person's shoe size

positive

negative

no correlation

29

1 pt

Identify the data set as having a positive, a negative, or no correlation.

#29 the age of a child and the amount of weekly allowance that the child receives

positive

negative

no correlation

30

1 pt

Identify the data set as having a positive, a negative, or no correlation.

#30 the distance one lives from school and the length of the school day

positive

negative

no correlation

31

1 pt

Identify the data set as having a positive, a negative, or no correlation.

#31 the average number of hours a child sleeps and the age of the child

positive

negative

no correlation

32

1 pt

Carmella made a scatter plot comparing the daily temperature and the number of people at a beach. Click on the link below and look at the scatter plots. Which of the three scatterplots most likely represents the data? Choose A, B, or C.

Scatter Plot Link

Scatter plot A

Scatter plot B

Scatter plot C

33

1 pt

Make a scatter plot of the data found in the link below. Answer question #34 to explain if there is a trend in your scatter plot.

Data Table

34

1 pt

Was there a trend in your scatter plot? If so, what was it?

35

1 pt

In a survey, a group of middle school students were randomly chosen and asked whether they would attend the school dance. Of these students, 65% said yes. If 52 students responded yes, how many students were surveyed?

36

1 pt

A candidate for city mayor wants to poll voters to see how well his campaign is going. What collection method should he use to gather his information?

Polling random grocery shoppers at the local market

Posting signs around town asking people to call in to voice their opinion

Calling a group of randomly selected registered voters

37

1 pt

An airline surveys passengers from a flight that is on time to determine if passengers on all flights are satisfied. This is a biased sample.

True

False

38

1 pt

A newspaper randomly chooses 100 names from its subscriber database and then surveys those subscribers to find out if they read the restaurant reviews. This is a biased sample.

True

False

39

1 pt

The manager of a bookstore sends a survey to 150 customers who were randomly selected from a customer list. This sample is not biased.

True

False

40

1 pt

A university has 30,600 students. In a random sample of 240 students, 20 speak three or more languages. Predict the number of students at the university who speak three or more languages.

Type only the number in your answer.

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