Exercise for topic two

Unit 2 Presenting data in tables and charts

1At a meeting of information systems offices for regional offices of a national company, a survey was taken to determine the number of employees the officers supervise in the operation of their departments, where X is the number of employees overseen by each information systems officer.

X   f

1 7

2 5

3 11

4 8

5 9

TABLE 2-2

1. Referring to Table 2-2, how many regional offices are represented in the survey results?

a) 5

b) 11

c) 15

d) 40

2. Referring to Table 2-2, across all of the regional offices, how many total employees were supervised by those surveyed?

a) 15

b) 40

c) 127

d) 200

3. The width of each bar in a histogram corresponds to the

a) differences between the boundaries of the class.

b) number of observations in each class.

c) midpoint of each class.

d) percentage of observations in each class.

TABLE 2-3

Every spring semester, the School of Business coordinates with local business leaders a luncheon for graduating seniors, their families, and friends. Corporate sponsorship pays for the lunches of each of the seniors, but students have to purchase tickets to cover the cost of lunches served to the guests they bring with them. The following histogram represents the attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheon, and f is the number of graduating seniors in each category.

4. Referring to the histogram from Table 2-3, how many graduating seniors attended the luncheon?

a) 4

b) 152

c) 275

d) 388

5. Referring to the histogram from Table 2-3, if all the tickets purchased were used, how many guests attended the luncheon?

a) 4

b) 152

c) 275

d) 388

6. A professor of economics at a small Texas university wanted to determine which year in school students were taking his tough economics course. Shown below is a pie chart of the results. What percentage of the class took the course prior to reaching their senior year?

a) 14%

b) 44%

c) 54%

d) 86%

7. When polygons or histograms are constructed, which axis must show the true zero or “origin”?

a) the horizontal axis

b) the vertical axis

c) both the horizontal and vertical axes

d) neither the horizontal nor the vertical axis

8. When constructing charts, the following is plotted at the class midpoints:

a) frequency histograms.

b) percentage polygons.

c) cumulative relative frequency ogives.

d) all of the above.

A sample of 200 students at a Big Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following table contains the result:

 Did Well on Midterm Did Poorly on Midterm Studying for Exam 80 20 Went Bar Hopping 30 70

TABLE 2-6

9. Referring to Table 2-6, of those who went bar hopping the weekend before the midterm in the sample, _______ percent of them did well on the midterm.

a) 15

b) 27.27

c) 30

d) 55

10. Referring to Table 2-6, of those who did well on the midterm in the sample,_______percent of them went bar hopping the weekend before the midterm.

a) 15

b) 27.27

c) 30

d) 55

11. Referring to Table 2-6,_______percent of the students in the sample went bar hopping the weekend before the midterm and did well on the midterm.

a) 15

b) 27.27

c) 30

d) 50

12. Referring to Table 2-6,______percent of the students in the sample spent the weekend studying and did well on the midterm.

a) 40

b) 50

c) 72.72

d) 80

13. Referring to Table 2-6, if the sample is a good representation of the population, we can expect _______percent of the students in the population to spend the weekend studying and do poorly on the midterm.

a) 10

b) 20

c) 45

d) 50

14. Referring to Table 2-6, if the sample is a good representation of the population, we can expect ________percent of those who spent the weekend studying to do poorly on the midterm.

a) 10

b) 20

c) 45

d) 50

15. Referring to Table 2-6, if the sample is a good representation of the population, we can expect _______percent of those who did poorly on the midterm to have spent the weekend studying.

a) 10

b) 22.22

c) 45

d) 50

16. In a contingency table, the number of rows and columns

a) must always be the same.

b) must always be 2.