INTRODUCTION TO STATISTICS EXAM
QUESTIONS WITH VERIFIED ANSWERS
1. Which of the following represents a quantitative variable?
A. Eye color
B. Zip code
C. Weight in pounds
D. Marital status
Answer: C
Conceptual Explanation: Weight is a numerical measurement representing a quantity,
making it a quantitative variable.
2. What type of data is classified into categories with no inherent ranking?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer: A
,Conceptual Explanation: Nominal data consists of categories that cannot be ordered or
ranked.
3. A sample is best defined as:
A. The entire group of individuals we want to study
B. A single numerical summary of a population
C. A subset of the population chosen to represent the population
D. The total number of parameters in a study
Answer: C
Conceptual Explanation: A sample is a subset of the population from which data is
actually collected.
4. Which measure of central tendency is most affected by extreme outliers?
A. Median
B. Mode
C. Interquartile range
D. Mean
Answer: D
Conceptual Explanation: The mean takes every value into account, making it sensitive to
extreme values or outliers.
, 5. If a distribution is skewed to the right, which of the following is typically true?
A. Mean equals the median
B. Mean is less than the median
C. Mode is greater than the mean
D. Mean is greater than the median
Answer: D
Conceptual Explanation: In a right-skewed distribution, the long tail to the right pulls the
mean higher than the median.
6. What does the standard deviation measure?
A. The center of the data
B. The spread or variability of the data around the mean
C. The difference between the maximum and minimum values
D. The probability of an event
Answer: B
Conceptual Explanation: Standard deviation quantifies the typical distance between data
points and the mean.
7. The Empirical Rule (68-95-99.7 rule) applies to which type of distribution?
A. Uniform distribution
QUESTIONS WITH VERIFIED ANSWERS
1. Which of the following represents a quantitative variable?
A. Eye color
B. Zip code
C. Weight in pounds
D. Marital status
Answer: C
Conceptual Explanation: Weight is a numerical measurement representing a quantity,
making it a quantitative variable.
2. What type of data is classified into categories with no inherent ranking?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer: A
,Conceptual Explanation: Nominal data consists of categories that cannot be ordered or
ranked.
3. A sample is best defined as:
A. The entire group of individuals we want to study
B. A single numerical summary of a population
C. A subset of the population chosen to represent the population
D. The total number of parameters in a study
Answer: C
Conceptual Explanation: A sample is a subset of the population from which data is
actually collected.
4. Which measure of central tendency is most affected by extreme outliers?
A. Median
B. Mode
C. Interquartile range
D. Mean
Answer: D
Conceptual Explanation: The mean takes every value into account, making it sensitive to
extreme values or outliers.
, 5. If a distribution is skewed to the right, which of the following is typically true?
A. Mean equals the median
B. Mean is less than the median
C. Mode is greater than the mean
D. Mean is greater than the median
Answer: D
Conceptual Explanation: In a right-skewed distribution, the long tail to the right pulls the
mean higher than the median.
6. What does the standard deviation measure?
A. The center of the data
B. The spread or variability of the data around the mean
C. The difference between the maximum and minimum values
D. The probability of an event
Answer: B
Conceptual Explanation: Standard deviation quantifies the typical distance between data
points and the mean.
7. The Empirical Rule (68-95-99.7 rule) applies to which type of distribution?
A. Uniform distribution
