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KING ABDULAZIZ UNVERSITY
Faculty of Sciences and Arts: Khulais
Time Allowed: 90 Minutes
Date: 23/12/1430H
B
STAT 110 - First Exam
Name:
ID:
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Section:
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You have 30 questions. You have 90 minutes to solve the exam. Please mark all your
answers on the answer sheet provided to you. You have to submit both question paper
and answer sheet but only the answer sheet will be graded.
Please: Make sure that the answer sheet form matches the question form.
Choose the best answer for each of the following questions:
Use the following to answer questions 1-9:
Suppose that you have the following set of numbers: 8, 2, 5, 3, 6, 7, 4, 5.
Q.1 The value of the mean is ……..
(A) 5
(B) 4.25 (C) 4
(D) 6.1
Q.2
The value of the mode is ……..
(A) 2
(B) 5
(C) 4
(D) 3
Q.3
The value of the first quartile (Q1) is ……..
(A) 2.5
(B) 3.5
(C) 2
(D) 3.25
Q.4
The value of the interquartile range (IQR) is ……...
(A) 3.15 (B) 4
(C) 3
(D) 3.5
Q.5
The value of the variance is ……..
(A) 5.5
(B) 5
(C) 4.5 (D) 4
Q.6
The value of the midrange is ……..
(A) 4
(B) 5.5
(C) 5
(D) 4.5
Q.7
The value of the coefficient of variation is ……..
(A) 55.4 %
(B) 55 %
(C) 40 %
(D) 50 %
Q.8
From the values of the mean, median, and mode, you can conclude that the
distribution of these data is ……..
(A) positively skewed
(C) negatively skewed
(B) symmetric
(D) left-skewed
Q.9
The distribution of these data is called …….. distribution.
(A) bimodal
(B) trimodal
(C) unimodal
(D) multimodal
Q.10
If we have measured the weights of a sample of 50 persons and computed their
median, this will be an example of …….. statistics.
(A) descriptive (B) inferential (C) predictive
(D) population
Q.11
Nationality is an example of what level of measurement?
(A) ordinal
(B) nominal
(C) ratio
(D) interval
Use the following frequency distribution to answer questions 12-17.
Class Limits
Frequency
Q.12
40-50 50-60 60-70 70-80 80-90 Total
3
4
6
5
2
20
The number of classes is ……..
(A) 3
(B) 6
(C) 4
(D) 5
Q.13 What is the width of the class 60 -70?
(A) 15
Q.14
Q.15
(B) 10
(C) 20
The modal class is ……..
(A) 70 - 80
(B) 60 - 70
(D) 5
(C) 50 - 60
The value of the range is ……..
(A) 50
(B) 45
(C) 40
(D) 40 - 50
(D) 55
Q.16
Using the class 70 - 80, the lower class boundary, and the class midpoint
are …… and ……, respectively.
(A) 69.85, 75
(B) 69.75, 70
(C) 69.5, 70 (D) 69.5, 75
Q.17
What is the cumulative frequency for the class 70 - 80?
(A) 16
(B) 12
(C) 18
(D) 17
Q.18
When data are categorized as Saudi, Egyptian, Syrian, or Sudanese, the most
appropriate measure of central tendency is the ………
(A) mean
(B) median
(C) midrange
(D) mode
The following is a histogram for the statistics scores of a group of 50 students.
Use this histogram to answer questions 19-20.
Q.19 The distribution of statistics scores is ……..
(A) positively skewed
(C) negatively skewed
(B) right-skewed
(D) symmetric
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Q.20 What do you expect for the values of the mean, median, and mode?
(A) mean = median
(B) mean > median
Q.21
(C) mean < median
(D) mean = mode
If a student scored 80 points on a test where the mean was 75 and the student's
z-score was 0.5, then the standard deviation, s, must be ……..
(A) 10
(B) 12
(C) 8
(D) 15
Q.22
When the distribution is normal or bell-shaped, if a data value is not within the
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range [x – 3s , x + 3s], then this value is called ……..
(A) the third quartile (B) an outlier (C) the first quartile (D) the midrange
Q.23
If a variable assumes the values 2, 3, 5, and 8, then this variable is a ……..
variable.
(A) continuous
(C) discrete
(B) continuous and quantitative
(D) discrete and qualitative
Q.24
The most appropriate measure of central tendency for the values 2, 3, 6, and
100 is the ……..
(A) mean
(B) median
(C) mode
(D) midrange
Q.25
If a variable can take any value between 0 and 15, then this variable is called
a …….. variable.
(A) continuous
(C) discrete and quantitative
(B) discrete
(D) continuous and qualitative
Q.26
When we want to compare the variability of students' weights and heights, we
should use the ……..
(A) variance (B) range (C) standard deviation (D) coefficient of variation
Q.27
What is the statistical term for the mean that is obtained by using the data
values of a sample drawn from a specific population.
(A) parameter
(B) statistic
(C) variable
(D) quantity
Q.28
If a researcher would like to determine the effect of height on weight, then
height is called a (an) …….. variable.
(A) dependent (B) outcome
(C) confounding
(D) independent
Q.29
Except for rounding error, relative frequencies should add up to what sum?
(A) 0
(B) 1
(C) 50
(D) 100
Q.30
If the mean of 10 values is 50, then the sum of the values is ……..
(A) 400
(B) 600
(C) 450
(D) 500
Good Luck …..
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