Math Quiz.- 2

MTH 165 Lund

Chapter 2 Take-home Quiz Covering 2.1, 2.2, 2.3

NO TUTORING CENTER HELP.

No credit will be given without supporting work. A quiz consisting of multiple pages must be

stapled. Quiz must be legible. Complete your work on a separate piece of paper.

1. (2pts each) In a national survey conducted by the Centers for Disease Control to determine

health-risk behaviors among college students, college students were asked, “How often do you

wear a seat belt when driving a car?” The frequencies were as follows:

Response Frequency

I do not drive a car 249

Never 118

Rarely 249

Sometimes 345

Most of the time 716

Always 3093

a. Construct a relative frequency distribution. b. Construct a relative frequency bar graph.

2. (2pts each) On the basis of the 2009 Current Population Survey, there were 94.5 million males and 102 million females 25 years old or older in the United States. The educational attainment

of the males and females was as follows:

Educational Attainment Males (in millions) Females (in millions)

Not a high school graduate 13.3 13.0

High school graduate 29.5 31.7

Some college, but no degree 15.8 18.0

Associate’s degree 7.5 9.8

Bachelor’s degree 18.0 19.6

Advanced degree 10.4 9.9

a. Construct a side-by-side frequency bar graph.

b. Is the side-by-side frequency bar graph a good comparison tool? Why or why not?

3. (2pts each) Below are listed the ages of the 50 richest people in the world in 2013. 89, 89, 87, 86, 86, 85, 83, 83, 82, 81, 80, 78, 78, 77,

76, 73, 73, 73, 72, 69, 69, 68, 67, 66, 66, 65, 65, 64,

63, 61, 61, 60, 59, 58, 57, 56, 54, 54, 53, 53, 51, 51,

49, 47, 46, 44, 43, 42, 36, 35

a. Construct a frequency distribution using a class width of 7 starting at 35. b. Create a frequency histogram using the frequency distribution from part (a).

4. (2 pts each) Consider the data below.

12.4 12.3 11.1 11.9

12.3 9.5 11.6 12.8

10.2 9.3 10.1 10.6

8.4

a. Use the data to construct a stem-and-leaf plot. Remember to include a key. b. What is the shape of the distribution?

5. (2pts) The safety manager at Klutz Enterprises provides the following graph to the plant manager and claims that the rate of worker injuries is 1/3 of what it used to be 12 years

ago. Does the graph support his claim? Explain your answer by writing complete

sentences.

6. Given the following graphic from a student newspaper which shows the number of car accidents in millions on the vertical axis and age of the driver on the horizontal axis.

Can you conclude that younger drivers are safer drivers than older ones? Why or why

not? (2 pts)

0.17

0.175

0.18

0.185

0.19

0.195

0.2

0.205

1992 2004

P ro

p o

rt io

n

Year

Proportion of Workers Injured