Descriptive Statistics — 2025 Past Questions

University of Ilorin STA111: 168 questions.

Topics: Presentation and Classification of Data, Measure of Central Tendency, Statistical Data, Graphical Representation of Data, Types, Sources, Method of Data Collection, Measures of Location, Partition and Dispersion

1. Using the blood group frequency data: A=9, B=7, O=3, AB=6. Find the relative frequency for blood group B.
   1. 0.28
   2. 17
   3. 16
   4. 0.36
2. Using the blood group frequency data: A=9, B=7, O=3, AB=6. Find the cumulative frequency for blood group AB.
   1. 0.24
   2. 19
   3. 25
   4. 9
3. Find the median from the frequency distribution: X values (0,1,2,3,4,5,6,7,8,9) with frequencies (1,1,2,3,6,8,3,2,1,0) respectively.
   1. 3
   2. 5
   3. 6
   4. 4
4. 8 bulbs were tested to determine their lifetime in hours with the following grouped frequency distribution: 50-54.5 (f=3), 55-59.5 (f=2), 60-64.5 (f=1), 65-69.5 (f=1), 70-74.5 (f=0), 75-79.5 (f=1). Obtain the median class.", "options": ["50 - 54.5", "55 - 59.5", "60 - 64.5", "65 - 69.5"]
   1. 50 - 54.5
   2. 55 - 59.5
   3. 60 - 64.5
   4. 65 - 69.5
5. A man kept count of numbers of GSM texts he received in total of 100 days with the following frequency distribution: 0 texts (40 days), 1 text (30 days), 2 texts (17 days), 3 texts (8 days), 4 texts (3 days), 5 texts (2 days). Find the median of texts per day.",
   1. 0
   2. 1
   3. 1.5
   4. 2
6. _________is the collection, organization, summarization, and presentation of data
   1. Descriptive statistics
   2. Quantitative statistics
   3. Inferential statistics
   4. Qualitative status
7. The most appropriate graphical representation for ordinal scale (categorical scale) is ________
   1. Ogive
   2. Pie chart
   3. Frequency polygon
   4. Histogram
8. ______ variables classify data into categories that can be ranked
   1. Ordinal
   2. Interval
   3. Nominal
   4. Ratio
9. All subjects possessing a common characteristic that is being studied is called _____
   1. Sample
   2. Population
   3. Census
   4. Statistics
10. The data below represents the scores of nine students in a test: 45, 32, 37, 46, 39, 36, 41, 48, 38. Find the geometric mean
    1. 20.01
    2. 35.16
    3. 41.25
    4. 45.63
11. Calculate the harmonic mean of the following 8 observations: 6, 7, 9, 3, 8, 5, 4, 2
    1. 4.5
    2. 5.3
    3. 6.1
    4. 7.2
12. The following are examples of sampling except
    1. Systematic
    2. Random
    3. Stepwise
    4. Cluster
13. An example of an ordinal scale is ______
    1. John
    2. Weight
    3. Colour
    4. Levels in the university
14. ______ scale classifies data into all-inclusive, mutually exclusive categories in which no order or ranking can be imposed on the data
    1. Ratio
    2. Nominal
    3. Ordinal
    4. Interval
15. Methods of sampling include the following except
    1. Stepwise
    2. Sampling
    3. Cluster
    4. Systematic
16. The following are measures of central tendency except
    1. Mode
    2. Range
    3. Harmonic mean
    4. Geometric mean
17. Data that cannot be ranked is known as ______
    1. Nominal
    2. Ordinal
    3. Interval
    4. Ratio
18. The middle of a class is ______
    1. Class representative
    2. Class width
    3. Class length
    4. Class midpoint
19. Which of the following is not part of an interval scale?
    1. Height
    2. Temperature
    3. Intelligent quotient
    4. Test scores
20. 8, 9, 10, 12, 4, 8, 2. Find the absolute mean deviation
    1. 4.62
    2. 3.0
    3. 2.61
    4. 3.87
21. The mean of random 15 numbers is 6 and the mean of random 24 numbers is 24. Find the mean of the 39 combined numbers
    1. 14.67
    2. 19.21
    3. 20.08
    4. 22.15
22. Types of bar charts except
    1. Multiple
    2. Component
    3. Random
    4. Simple
23. Another name for Ogive is ______
    1. Cumulative frequency curve
    2. Histogram
    3. Box plot
    4. Frequency polygon
24. Example of nominal scale
    1. Colour
    2. University grade
    3. Levels in university
    4. Temperature
25. A surveyor is asked to take a population survey of 5000 people. 30% of them are unemployed, 60% are retired. Which survey method is not suitable?
    1. Giving out questionnaires
    2. Census counting
    3. Going back to respondents
    4. Going back to non-respondents
26. Which of the following is not an ordinal scale?
    1. Grades in university
    2. Colour
    3. Levels in university
    4. Matriculation number
27. Which is the formula for geometric mean?
    1. GM = √(x₁ × x₂ × ... × xn)
    2. GM = Σx / n
    3. GM = 1/n (Σ 1/x)
    4. GM = Σ log(x)
28. A random variable which is more than the rest of the distribution is ______
    1. Mean
    2. Median
    3. Mode
    4. Outlier
29. Which of these is an ordinal scale?
    1. Levels in the university
    2. Colour
    3. Weight
    4. John
30. Find the absolute mean deviation for the set: 8, 9, 10, 12, 4, 8, 2
    1. 3.87
    2. 3.0
    3. 4.62
    4. 2.61
31. The data below represents the score of nine students in a test: 45, 32, 37, 46, 39, 36, 41, 48, 38. Find the geometric mean.
    1. 19.22
    2. 22.03
    3. 39.68
    4. 43.28
32. The arithmetic mean of 15 randomly selected numbers is 6, and that of 24 numbers is 12. Find the mean of the combined 39 numbers.
    1. 13.23
    2. 90.45
    3. 9.69
    4. 29.63
33. ______ is the type of categorical data that represents variables with no order.
    1. Nominal
    2. Ordinal
    3. Interval
    4. Ratio
34. The most appropriate measure of location is ______.
    1. Median
    2. Mean
    3. Geometric
    4. Mode
35. Another name for Ogives is ______.
    1. Cumulative frequency curve
    2. Line graph
    3. Histogram
    4. Bar chart
36. Data collected by an investigator is called ______.
    1. Primary data
    2. Secondary data
    3. Qualitative data
    4. Quantitative data
37. Calculate the relative frequency of blood group O if the data is: A = 9, B = 7, O = 3, AB = 6.
    1. 0.1
    2. 0.2
    3. 0.3
    4. 0.4
38. What is another name for a multiple bar?
    1. Stacked
    2. Clustered
    3. Component
    4. Simple
39. ______ is the difference between the lower limit and the upper limit.
    1. Range
    2. Class mark
    3. Class width
    4. Variance
40. The following are measures of central tendency except ______.
    1. Harmonic mean
    2. Geometric mean
    3. Range
    4. Mode
41. The data that is being collected for the first time and hasn't been used by any investigator for research purposes is termed ______.
    1. Primary data
    2. Secondary data
    3. Qualitative data
    4. Quantitative data
42. A characteristic or measure obtained from a sample is ______.
    1. Census
    2. Sampler
    3. Statistics
    4. Parameter
43. Adding the upper limit and lower limit and dividing by two gives ______.
    1. Midpoint
    2. Midrange
    3. Class length
    4. Class range
44. What is an example of ordinal data?
    1. University grade
    2. Level in university
    3. Temperature
    4. Height
45. What is an example of nominal data?
    1. Levels in university
    2. Grades in university
    3. Gender
    4. Color
46. What is the appropriate measure of central tendency?
    1. Mean
    2. Median
    3. Mode
    4. Variance
47. The difference between the lower class limit and the upper class limit is ______.
    1. Midpoint
    2. Class size
    3. Variance
    4. Range
48. What is the best graphical representation for nominal (categorical frequency distribution)?
    1. Frequency polygon
    2. Ogive
    3. Pie chart
    4. Histogram
49. A frequency distribution with nominal and ordinal data is called ______.
    1. Categorical frequency distribution
    2. Relative frequency distribution
    3. Grouped frequency distribution
    4. Continuous frequency distribution
50. A characteristic or measure obtained from a population is called a ______.
    1. Sample
    2. Statistic
    3. Parameter
    4. Census
51. Types of statistics:
    1. Descriptive and Inferential
    2. Quantitative and Qualitative
    3. Primary and Secondary
    4. Population and Sample
52. The difference between the maximum and minimum values in a dataset is called:
    1. Median
    2. Mode
    3. Range
    4. Mean
53. Which of the following data types is numeric?
    1. Qualitative
    2. Categorical
    3. Quantitative
    4. Nominal
54. A random variable that takes a non-countably infinite number of values is ______.
    1. Discrete
    2. Continuous
    3. Nominal
    4. Ordinal
55. Variables that assume numerical values are ______.
    1. Quantitative
    2. Qualitative
    3. Ordinal
    4. Categorical
56. Adding upper and lower class limits and dividing by 2 is ______.
    1. Class mark
    2. Midpoint
    3. Class size
    4. Range
57. Another name for class width is ______.
    1. Class size
    2. Class range
    3. Class midpoint
    4. Class length
58. _________is the collection, organization, summarization, and presentation of data
    1. Descriptive statistics
    2. Quantitative statistics
    3. Inferential statistics
    4. Qualitative status
59. The most appropriate graphical representation for ordinal scale (categorical scale) is __
    1. Ogive
    2. Pie chart
    3. Frequency polygon
    4. Histogram
60. variables classify data into categories that can be ranked
    1. Ordinal
    2. Interval
    3. Nominal
    4. Ratio
61. All subjects possessing a common characteristic that is being studied is called _____
    1. Sample
    2. Population
    3. Census
    4. Statistics
62. The data below represents the scores of nine students in a test: 45, 32, 37, 46, 39, 36, 41, 48, 38. Find the geometric mean
    1. 20.01
    2. 35.16
    3. 41.25
    4. 45.63
63. Calculate the harmonic mean of the following 8 observations: 6, 7, 9, 3, 8, 5, 4, 2
    1. 4.5
    2. 5.3
    3. 6.1
    4. 7.2
64. The following are examples of sampling except
    1. Systematic
    2. Random
    3. Stepwise
    4. Cluster
65. An example of an ordinal scale is
    1. John
    2. Weight
    3. Colour
    4. Levels in the university
66. scale classifies data into all-inclusive, mutually exclusive categories in which no order or ranking can be imposed on the data
    1. Ratio
    2. Nominal
    3. Ordinal
    4. Interval
67. Methods of sampling include the following except
    1. Stepwise
    2. Sampling
    3. Cluster
    4. Systematic
68. The following are measures of central tendency except
    1. Mode
    2. Range
    3. Harmonic mean
    4. Geometric mean
69. Data that cannot be ranked is known as ______
    1. Nominal
    2. Ordinal
    3. Interval
    4. Ratio
70. The middle of a class is ______
    1. Class representative
    2. Class width
    3. Class length
    4. Class midpoint
71. Which of the following is not part of an interval scale?
    1. Height
    2. Temperature
    3. Intelligent quotient
    4. Test scores
72. 8, 9, 10, 12, 4, 8, 2. Find the absolute mean deviation
    1. 4.62
    2. 3.0
    3. 2.61
    4. 3.87
73. The mean of random 15 numbers is 6 and the mean of random 24 numbers is 24. Find the mean of the 39 combined numbers
    1. 14.67
    2. 19.21
    3. 20.08
    4. 22.15
74. Types of bar charts except
    1. Multiple
    2. Component
    3. Random
    4. Simple
75. Another name for Ogive is ______
    1. Cumulative frequency curve
    2. Histogram
    3. Box plot
    4. Frequency polygon
76. Example of nominal scale
    1. Colour
    2. University grade
    3. Levels in university
    4. Temperature
77. A surveyor is asked to take a population survey of 5000 people. 30% of them are unemployed, 60% are retired. Which survey method is not suitable?
    1. Giving out questionnaires
    2. Census counting
    3. Going back to respondents
    4. Going back to non-respondents
78. Which of the following is not an ordinal scale?
    1. Grades in university
    2. Colour
    3. Levels in university
    4. Matriculation number
79. Which is the formula for geometric mean?
    1. GM = √(x₁ × x₂ × ... × xn)
    2. GM = Σx / n
    3. GM = 1/n (Σ 1/x)
    4. GM = Σ log(x)
80. A random variable which is more than the rest of the distribution is
    1. Mean
    2. Median
    3. Mode
    4. Outlier
81. Which of these is an ordinal scale?
    1. Levels in the university
    2. Colour
    3. Weight
    4. John
82. Find the absolute mean deviation for the set: 8, 9, 10, 12, 4, 8, 2
    1. 3.87
    2. 3.0
    3. 4.62
    4. 2.61
83. The data below represents the score of nine students in a test: 45, 32, 37, 46, 39, 36, 41, 48, 38. Find the geometric mean.
    1. 19.22
    2. 22.03
    3. 39.68
    4. 43.28
84. The arithmetic mean of 15 randomly selected numbers is 6, and that of 24 numbers is 12. Find the mean of the combined 39 numbers.
    1. 13.23
    2. 90.45
    3. 9.69
    4. 29.63
85. is the type of categorical data that represents variables with no order.
    1. Nominal
    2. Ordinal
    3. Interval
    4. Ratio
86. The most appropriate measure of location is ______.
    1. Median
    2. Mean
    3. Geometric
    4. Mode
87. Another name for Ogives is ______.
    1. Cumulative frequency curve
    2. Line graph
    3. Histogram
    4. Bar chart
88. Data collected by an investigator is called .
    1. Primary data
    2. Secondary data
    3. Qualitative data
    4. Quantitative data
89. Calculate the relative frequency of blood group O if the data is: A = 9, B = 7, O = 3, AB = 6.
    1. 0.1
    2. 0.2
    3. 0.3
    4. 0.4
90. What is another name for a multiple bar?
    1. Stacked
    2. Clustered
    3. Component
    4. Simple
91. is the difference between the lower limit and the upper limit.
    1. Range
    2. Class mark
    3. Class width
    4. Variance
92. The following are measures of central tendency except ______.
    1. Harmonic mean
    2. Geometric mean
    3. Range
    4. Mode
93. The data that is being collected for the first time and hasn't been used by any investigator for research purposes is termed ______.
    1. Primary data
    2. Secondary data
    3. Qualitative data
    4. Quantitative data
94. A characteristic or measure obtained from a sample is ______.
    1. Census
    2. Sampler
    3. Statistics
    4. Parameter
95. Adding the upper limit and lower limit and dividing by two gives ______.
    1. Midpoint
    2. Midrange
    3. Class length
    4. Class range
96. What is an example of ordinal data?
    1. University grade
    2. Level in university
    3. Temperature
    4. Height
97. What is an example of nominal data?
    1. Levels in university
    2. Grades in university
    3. Gender
    4. Color
98. What is the appropriate measure of central tendency?
    1. Mean
    2. Median
    3. Mode
    4. Variance
99. The difference between the lower class limit and the upper class limit is ______.
    1. Midpoint
    2. Class size
    3. Variance
    4. Range
100. What is the best graphical representation for nominal (categorical frequency distribution)?
     1. Frequency polygon
     2. Ogive
     3. Pie chart
     4. Histogram

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