Practice Quiz: Chapter 2

1(points: 2) Abigail asked a number of students their major. She found 35 in liberal arts, 10 in criminal justice, 25 in nursing, 45 in business, and 20 in other majors. What was the relative frequency of the nursing group, rounded to the nearest whole percent?

2(points: 1) Bert asked his fellow students how many books they read for pleasure in a year. He found that most of them read 0, 1, or 2 books, but some read 3 or more and a very few read as many as 10. (He plotted the histogram shown at right.) What is the word or short phrase we learned to describe the shape of this distribution?

3(points: 3) Here are some exam scores. Make a stem-and-leaf diagram. (You need not sort the leaves.)

83 78 99 60 87 74 64 55 81 81 87 91 69 77 94 65 72

Test scores, x	Frequencies, f
470.0–479.9	15
480.0–489.9	22
490.0–499.9	29
500.0–509.9	50
510.0–519.9	38

4(points: 5)  At right is a grouped frequency distribution. Create a frequency histogram. (For a real quiz, you’d use graph paper, but you can freehand this one.)

5(points: 1) What is the class width in the previous problem?

6(points: 2) Name two types of graph that are suited to displaying qualitative data.

7(points: 1)  On a histogram or bar graph, to make sure the graph is not misleading, the vertical axis must always _____________________.