1. Raw data are the data that:
A) are presented in the form of a frequency table
B) give information on each individual sample member separately
C) are arranged in increasing order
D) are arranged in a random order
2. We obtain the relative frequency of a category by:
A) dividing the frequency of that category by the sum of all frequencies
B) multiplying the frequency of that category by 100
C) dividing the frequency of that category by 100
D) dividing the sum of all frequencies by the frequency of that category
3. We obtain the percentage of a category by:
A) multiplying the frequency of that category by 100
B) multiplying the relative frequency of that category by 100
C) dividing the frequency of that category by 100
D) dividing the sum of all frequencies by the frequency of that category
Use the following to answer questions 4-8:
The following table gives the frequency distribution of the highest degrees held by 25
professionals.
Highest Degree
f
Bachelor’s
12
Master’s
9
Doctorate
4
4. The number of persons with a Master’s degree as their highest degree is:
5. The number of persons who possess a Doctorate is:
Chapter 2
6. The percentage of persons with a Bachelor’s degree as the highest degree is:
7. The percentage of persons who hold a Doctorate is:
8. The percentage of persons who do not hold a Doctorate is:
Use the following to answer questions 9-13:
The following table gives the frequency distribution of opinions of 50 persons in regard to an
issue.
Opinion
f
In favor
20
Against
19
No opinion
11
9. The percentage of persons who have no opinion is:
10. The relative frequency, expressed to two decimal places, of the “Against” category is:
11. The sample size is:
12. The percentage of persons who are either against this issue or have no opinion is:
Chapter 2
13. The percentage of persons who are either in favor of this issue or have no opinion is:
14. In a frequency distribution, the classes should always:
A) be overlapping C) have a width of 10
B) have the same frequency D) be non-overlapping
15. The number of classes in a frequency distribution depends on the size of the data set. In
general, the:
A) larger the data set, the larger the number of classes
B) larger the data set, the smaller the number of classes
C) number of classes should be equal to the number of values in the data set divided
by 5
D) smaller the data set, the larger the number of classes
16. When preparing a frequency distribution, the lower limit of the first class should always
be:
A) a number that is greater than the smallest value in the data set
B) equal to 10
C) a number that is less than or equal to the smallest value in the data set
D) equal to zero
17. A distribution curve that is right-skewed has:
A) both tails of the same length C) a shorter tail on the right side
B) a longer tail on the left side D) a longer tail on the right side
18. A symmetric distribution curve:
A) has a longer tail on the right side C) is identical on both sides of the mean
B) has a longer tail on the left side D) is triangular in shape
Chapter 2
19. The procedure for obtaining the midpoint of a class is to:
A) add the lower limit to the upper limit of the previous class
B) subtract the lower limit from the upper limit
C) multiply the sum of the two class limits by 2
D) divide the sum of the two class limits by 2
20. The procedure for obtaining the relative frequency of a class is to:
A) divide the frequency of that class by the sum of all frequencies
B) multiply the frequency of that class by 100
C) divide the frequency of that class by 100
D) divide the sum of all frequencies by the frequency of that class
21. The procedure for obtaining the percentage for a class is to:
A) multiply the frequency of that class by 100
B) multiply the relative frequency of that class by 100
C) divide the relative frequency of that class by 100
D) divide the sum of all frequencies by 100
22. In a frequency histogram, the frequency of a class is the:
A) height of the corresponding bar
B) width of the corresponding bar
C) height multiplied by the width of the corresponding bar
D) height divided by the width of the corresponding bar
23. We can construct a frequency histogram for:
A) qualitative data only C) qualitative and quantitative data
B) any kind of data D) continuous data
24. In a frequency distribution, the correct notation for the sum of the frequencies is:
A)
f
B)
f
C)
x
D)
y
25. A rectangular histogram has:
A) a longer tail on the right side C) shorter tails on both sides
B) a longer tail on the left side D) the same frequency for each class
Chapter 2
Use the following to answer questions 26-35:
The following table gives the frequency distribution of test scores for a math class of 30 students.
Score
61 to 70
71 to 80
81 to 90
91 to 100
26. The number of classes in this frequency table is:
27. The width of each class in this frequency table is:
28. The midpoint of the fourth class is:
29. The lower boundary of the first class is:
30. The upper boundary of the third class is:
31. The sample size is:
32. The relative frequency of the second class, rounded to three decimal places, is:
Chapter 2
33. The percentage of students who scored 80 or less on the test, rounded to two decimal
places, is:
34. The lower limit of the fourth class is:
35. The upper limit of the fourth class is:
Use the following to answer questions 36-45:
The following table gives the frequency distribution of rents paid per month by 500 families
selected from a city.
Rent
301 to 400
401 to 500
501 to 600
601 to 700
701 to 800
801 to 900
36. The number of classes in this frequency table is:
37. The width of each class in this frequency table is:
38. The midpoint of the second class is:
Chapter 2
39. The lower boundary of the fifth class is:
40. The upper boundary of the fourth class is:
41. The sample size is:
42. The relative frequency of the sixth class, rounded to three decimal places, is:
43. The percentage of families who paid a rent of $500 or less per month, rounded to one
decimal place, is:
44. The lower limit of the third class is:
45. The upper limit of the second class is:
Chapter 2
Use the following to answer questions 46-51:
The following table gives the frequency distribution of the number of telephones owned by a
sample of 50 households selected from a city.
Number of
Telephones Owned
f
0
3
1
20
2
14
3
3
4
10
46. The relative frequency of the second class, rounded to two decimal places, is:
47. The number of households which own more than one telephone is:
48. The percentage of households which own three or more telephones is:
49. The number of households which own one or two telephones is:
50. The percentage of households which do not own a telephone is:
51. The number of classes for this frequency distribution table is::
Chapter 2
Use the following to answer questions 52-57:
The following table gives the frequency distribution of the number of rooms for a sample of 100
houses.
Number of Rooms
f
2
8
3
10
4
20
5
24
6
18
7
10
8
10
52. The relative frequency of the fourth class, rounded to two decimal places, is:
53. The percentage of houses that have three or fewer rooms is:
54. The percentage of houses that contain five or more rooms is:
55. The number of houses that contain four or five rooms is:
56. The relative frequency of the fifth class, rounded to two decimal places, is:
57. The number of classes for this frequency distribution table is:
Chapter 2
58. We construct an ogive to graph a:
A) frequency distribution C) relative frequency distribution
B) cumulative frequency distribution D) stem-and-leaf display
59. The graph of a cumulative frequency distribution is a(n):
A) frequency histogram B) stem-and-leaf display C) line graph D) ogive
Use the following to answer questions 60-66:
The following table gives the cumulative frequency distribution of annual incomes (in thousands
of dollars) for a sample of 200 families selected from a city.
Income ($1000’s)
f
10 to less than 25
25
10 to less than 40
79
10 to less than 55
149
10 to less than 70
167
10 to less than 85
191
10 to less than 100
200
60. The cumulative relative frequency of the fourth class, rounded to three decimal places, is:
61. The sample size is:
62. The cumulative percentage for the second class, rounded to one decimal place, is:
63. The percentage of families with an income of less than $55,000, rounded to one decimal
place, is:
Chapter 2
64. The percentage of families with an income of $70,000 or more, rounded to one decimal
place, is:
65. The number of families with an income of $40,000 or less is:
66. The number of families with an income of $85,000 or more is:
Use the following to answer questions 67-72:
The following table gives the cumulative frequency distribution of the commuting time (in
minutes) from home to work for a sample of 400 persons selected from a city.
Time (minutes)
f
0 to less than 10
67
0 to less than 20
158
0 to less than 30
223
0 to less than 40
291
0 to less than 50
350
0 to less than 60
400
67. The sample size is:
68. The percentage of persons who commute for less than 30 minutes, rounded to two
decimal places, is:
69. The cumulative relative frequency of the fourth class, rounded to four decimal places, is: