c Unit 4 Practice Test name, date, hour:

Instructions: Choose the best answer for each multiple choice question. Circle the answer.

The coaches of a group of debate teams answered a survey about hours of debate, team practice and number of team wins. The graph shows the results of this survey.

1. The scatterplot indicates which of the following?

A a positive correlationB a negative correlationC no correlationD a non-linear correlation

2. Based on these results, if a team practices 4 hours per week next season, which is the best estimate of the number of debates the team can expect to win?

A 20B 16C 12D 1

3. Josie and some of her friends rode motorcycles all day on Saturday. She made a table that showed the number of gallons of gas remaining at the end of each hour. The scatterplot below shows the gas that remained in terms of the hours that had passed.

Which of the following describes the correlation between the gas that remained and the hours that had passed?

A Positive correlationB No correlationC Negative correlationD Undefined correlation

4. Teresa records the ages and weights of 12 children in her neighborhood. If she records this data in a scatterplot, what type of relationship will she most likely see?

A Positive correlationB Negative correlationC No correlationD Constant correlation

A carpenter recorded the amount of money he earned for different jobs and the amount of time he spent on each job. The data are shown in the scatterplot below:

5. Based on the data, which best represents the amount of money the carpenter would earn from a job that took 5 days to complete?

A $2500B $500C $1250D $200

6. According to the graph above, the relationship between the carpenter’s earnings and the amount of time he spent on jobs is:

A a positive correlationB a negative correlationC no correlationD multiple correlations

7. As the age of a car increases, its value decreases. Which scatterplot best represents this relationship?

8.

9. Which equation best represents the line of best fit for the following graph

A y=x

B y=23x+1

C y=32x+4

D y=32x+1

10. The table below shows Cobi’s hours of exercise and weight loss each week.

Create a scatterplot from the data in the table.

What type of correlation did you find between hours of exercise and weight loss? Write the equation of the line of best fit.

11.

Hours of exercise Weight loss (pounds)1.3 0.53 2.85 3.52 2.54 3

12.

13. Using the two-way table below, what is the missing value for students who did volunteer work but were not accepted to ivy league schools.

A. 27B. 88C. 80D. 53

14.

What percent of boys prefer sports?

a. 55%b. 47%c. 26%d. 45%

15.

Use the two-way table below to answer questions 16 and 17.

Students Graduates Not Graduates Total

Boys 16 29 45Girls 13 12 25Total 29 41 70

16. What is the relative frequency of boys that are graduates? Round to the nearest hundredth if necessary.

a. 4.43 b. 4.48 c. 0.22 d. 0.23

17. What is the relative frequency of students that neither graduated nor are girls?

a. 40% b. 41% c. 138% d. 72%

Food Favorite Food Not Favorite Food TotalPizza 15 35 50

Burger 24 26 50Total 39 61 100

Use the two-way table below to answer questions 18 and 19.

18. What is the relative frequency of people with their favorite food being pizza?a . 15

100 b. 50100 c. 39

100 d. 61100

19. What percentage of people did not choose a burger as their favorite food?

a. 50% b. 26% c. 76% d. 61%

Use the two-way table below to answer questions 20-23.The following table shows the results of survey where band students were asked if they’d like to sing or dance in the upcoming spring concert. Complete the table.

Sing No Sing TotalDance 17 24 41

No Dance 21 40Total 38 43

20. What are the two categories of data being displayed in the table? a. sing and dance b. total and sub-total

c. dancing and playing in concert d. singing and playing in concert

21. What is the total number of students represented in the survey?a. 38 b. 40 c. 81 d. 43

22. How many students would prefer not to dance or sing? a. 21 b. 19 c. 24 d. 83

23. What percentage of students that are interested in singing, would also like to dance?

a. 20% b. 21% c. 44% d. 45%

24. Choose the best description of the trend in the scatter plot below.

8.SP.2 10. Is there a relationship shown in the

scatter plot?

25. What type of trend would you expect to see in a scatter plot comparing mosquito

population and the sale of insect repellent?

a. As the world oil production increases, the U.S. percent of oil production decreases.

b. As the world oil production increases, the U.S. percent of oil production increases.

c. As the world oil production decreases, the U.S. oil production decreases.

d. As the world oil production decreases, the U.S. oil production does not change.

a. positive b. negative c. none d. opposite

26. Choose the scatter plot that shows the strongest negative association between data points.

A. B. C. D.

27. Give the coordinates of the outlier that appears on the scatter plot below.

a. (0,0)

b. (42,10)

c. (50,50)

d. (12, 6)

Use the scatter plot above to answer questions 28-30.

28. What is evident in this scatter plot?

a. There is a directly linear relationship between the waiting time for eruptions and the length of the eruption.b. There is a negative association between the waiting time and the duration of the eruption.c. There are clusters of data points around 2 minutes of waiting time and 4.5 minutes of waiting time.d. There are not many eruptions of Old Faithful.

29. If you wait about an hour to see Old Faithful erupt, it may last for a. 2 minutes b. 2.25 minutes c. 3 minutes d. 5

minutes

30. How long would you most likely have to wait to see an eruption lasting 4 minutes?a. an hour b. 70 minutes c. 80 minutes d. 90 minutes

31. Which of the following shows the best line of fit for the data?

32. Describe the pattern in the table.

a. The average years of education appears to have an effect on the unemployment rate.

b. As the average years of education increases the unemployment rate decreases.

c. As the average years of education decreases, the unemployment rate increases

d. All of the above.

33. Using the scatter plot above, predict the value of y, when x = 4.a. 1.6 b. 8 c. 9 d. 10

34. The following scatter diagram shows two sets of data, x and y, that show high positive correlation. Which of the equations below gives the most accurate answer for the equation of the line of best fit?

a. y = -1.5x + 2

b. y = 2x + 3

c. y= 3x + 1

d. y = 3x + 2