Psychology Statistics Exam Bank 2026/2027 |
Verified Questions Official Academic Board of
Psychology | Verified Q&A | Undergraduate
Psychology Students
DISCLAIMER: This examination is prepared for educational purposes to
support undergraduate psychology statistics preparation. Statistical decisions
require integration with research methodology principles, appropriate test
selection, and clinical judgment
MEASURES OF CENTRAL TENDENCY
1. A researcher records the quiz scores 4, 6, 8, and 10. What is the mean
score?
A. 6
B. 7
C. 8
D. 9
Answer: B
Rationale: The mean is found by adding the values and dividing by the
number of scores. Here, 4 + 6 + 8 + 10 = 28, and 28 divided by 4 equals 7.
2. A dataset contains the following scores: 2, 3, 5, 7, 8, 10, 12. What is the
median?
A. 5
B. 6
C. 7
D. 8
Answer: C
,Rationale: The median is the middle value when scores are arranged in order.
With 7 scores, the 4th score (7) is the median.
3. What is the mode of the following dataset: 2, 3, 3, 4, 5, 5, 5, 6?
A. 3
B. 4
C. 5
D. 6
Answer: C
Rationale: The mode is the most frequently occurring value. The score 5
appears three times, more than any other score.
4. When is the median a better measure of central tendency than the
mean?
A. When the data are normally distributed
B. When the data contain extreme outliers
C. When the data are symmetrical
D. When the data have a large sample size
Answer: B
Rationale: The median is robust to outliers and is preferred when the
distribution is skewed or contains extreme values that would unduly influence
the mean.
5. A researcher computes the mean, median, and mode of a dataset.
Which statement is true for a positively skewed distribution?
A. Mean < Median < Mode
B. Mode < Median < Mean
C. Mean = Median = Mode
D. Median < Mode < Mean
Answer: B
,Rationale: In a positively skewed distribution, the tail extends to the right,
pulling the mean in that direction. The order is Mode < Median < Mean.
6. A dataset has a mean of 50 and a median of 55. What does this suggest
about the distribution?
A. The distribution is positively skewed
B. The distribution is negatively skewed
C. The distribution is symmetrical
D. The distribution is bimodal
Answer: B
Rationale: When the mean is less than the median, the distribution is
negatively skewed (tail extends to the left).
7. What is the mean of the following dataset: 10, 15, 20, 25, 30?
A. 20
B. 21
C. 22
D. 25
Answer: A
Rationale: (10 + 15 + 20 + 25 + 30) ÷ 5 = 100 ÷ 5 = 20.
8. A dataset contains the values: 1, 1, 2, 3, 4, 5, 100. Which measure of
central tendency best represents the typical score?
A. Mean
B. Median
C. Mode
D. Range
Answer: B
, Rationale: The median is the best measure because the extreme outlier (100)
would distort the mean.
9. What is the mode of a dataset where all values occur exactly once?
A. The mean
B. The median
C. No mode
D. All values are modes
Answer: C
Rationale: When no value repeats, the dataset has no mode.
10. A researcher reports that a dataset has a mean of 100 and a standard
deviation of 15. Approximately what percentage of scores fall between
85 and 115?
A. 34%
B. 68%
C. 95%
D. 99.7%
Answer: B
Rationale: In a normal distribution, approximately 68% of scores fall within
±1 standard deviation of the mean (100 ± 15 = 85 to 115).
MEASURES OF VARIABILITY
11. What is the range of the following dataset: 5, 8, 12, 15, 20?
A. 10
B. 12
C. 15
D. 20
Answer: C
Verified Questions Official Academic Board of
Psychology | Verified Q&A | Undergraduate
Psychology Students
DISCLAIMER: This examination is prepared for educational purposes to
support undergraduate psychology statistics preparation. Statistical decisions
require integration with research methodology principles, appropriate test
selection, and clinical judgment
MEASURES OF CENTRAL TENDENCY
1. A researcher records the quiz scores 4, 6, 8, and 10. What is the mean
score?
A. 6
B. 7
C. 8
D. 9
Answer: B
Rationale: The mean is found by adding the values and dividing by the
number of scores. Here, 4 + 6 + 8 + 10 = 28, and 28 divided by 4 equals 7.
2. A dataset contains the following scores: 2, 3, 5, 7, 8, 10, 12. What is the
median?
A. 5
B. 6
C. 7
D. 8
Answer: C
,Rationale: The median is the middle value when scores are arranged in order.
With 7 scores, the 4th score (7) is the median.
3. What is the mode of the following dataset: 2, 3, 3, 4, 5, 5, 5, 6?
A. 3
B. 4
C. 5
D. 6
Answer: C
Rationale: The mode is the most frequently occurring value. The score 5
appears three times, more than any other score.
4. When is the median a better measure of central tendency than the
mean?
A. When the data are normally distributed
B. When the data contain extreme outliers
C. When the data are symmetrical
D. When the data have a large sample size
Answer: B
Rationale: The median is robust to outliers and is preferred when the
distribution is skewed or contains extreme values that would unduly influence
the mean.
5. A researcher computes the mean, median, and mode of a dataset.
Which statement is true for a positively skewed distribution?
A. Mean < Median < Mode
B. Mode < Median < Mean
C. Mean = Median = Mode
D. Median < Mode < Mean
Answer: B
,Rationale: In a positively skewed distribution, the tail extends to the right,
pulling the mean in that direction. The order is Mode < Median < Mean.
6. A dataset has a mean of 50 and a median of 55. What does this suggest
about the distribution?
A. The distribution is positively skewed
B. The distribution is negatively skewed
C. The distribution is symmetrical
D. The distribution is bimodal
Answer: B
Rationale: When the mean is less than the median, the distribution is
negatively skewed (tail extends to the left).
7. What is the mean of the following dataset: 10, 15, 20, 25, 30?
A. 20
B. 21
C. 22
D. 25
Answer: A
Rationale: (10 + 15 + 20 + 25 + 30) ÷ 5 = 100 ÷ 5 = 20.
8. A dataset contains the values: 1, 1, 2, 3, 4, 5, 100. Which measure of
central tendency best represents the typical score?
A. Mean
B. Median
C. Mode
D. Range
Answer: B
, Rationale: The median is the best measure because the extreme outlier (100)
would distort the mean.
9. What is the mode of a dataset where all values occur exactly once?
A. The mean
B. The median
C. No mode
D. All values are modes
Answer: C
Rationale: When no value repeats, the dataset has no mode.
10. A researcher reports that a dataset has a mean of 100 and a standard
deviation of 15. Approximately what percentage of scores fall between
85 and 115?
A. 34%
B. 68%
C. 95%
D. 99.7%
Answer: B
Rationale: In a normal distribution, approximately 68% of scores fall within
±1 standard deviation of the mean (100 ± 15 = 85 to 115).
MEASURES OF VARIABILITY
11. What is the range of the following dataset: 5, 8, 12, 15, 20?
A. 10
B. 12
C. 15
D. 20
Answer: C
