STRAIGHTERLINE INTRODUCTION TO
STATISTICS QUESTIONS WITH
VERIFIED ANSWERS
1. Which of the following is a discrete random variable?
A. The weight of a newborn baby
B. The exact time it takes to run a mile
C. The number of students in a classroom
D. The height of an adult oak tree
Answer: C
Conceptual Explanation: A discrete variable has countable values, such as the number of
students, whereas weights, times, and heights are continuous.
2. What measure of center is most sensitive to extreme outliers?
A. Mode
B. Median
C. Mean
D. Interquartile range
,Answer: C
Conceptual Explanation: The mean takes every value into account, making it heavily
influenced by extremely large or small values.
3. In a standard normal distribution, what is the mean and standard deviation?
A. Mean = 1, Standard Deviation = 0
B. Mean = 100, Standard Deviation = 15
C. Mean = 0, Standard Deviation = 1
D. Mean = 0, Standard Deviation = 0
Answer: C
Conceptual Explanation: By definition, the standard normal distribution always has a
mean of 0 and a standard deviation of 1.
4. What type of graph is best suited for showing the relationship between two quantitative
variables?
A. Pie chart
B. Bar chart
C. Scatterplot
D. Boxplot
Answer: C
, Conceptual Explanation: Scatterplots use Cartesian coordinates to display values for
typically two variables for a set of data.
5. If the correlation coefficient (r) is -0.85, what does this indicate about the relationship
between the two variables?
A. Strong positive linear relationship
B. Weak positive linear relationship
C. Strong negative linear relationship
D. Weak negative linear relationship
Answer: C
Conceptual Explanation: A value close to -1 indicates a strong negative linear association.
6. What is the sum of all probabilities in a discrete probability distribution?
A. 0
B. 0.5
C. 1
D. It depends on the sample size
Answer: C
Conceptual Explanation: A fundamental rule of probability is that the sum of all
probabilities in a sample space must equal 1.
STATISTICS QUESTIONS WITH
VERIFIED ANSWERS
1. Which of the following is a discrete random variable?
A. The weight of a newborn baby
B. The exact time it takes to run a mile
C. The number of students in a classroom
D. The height of an adult oak tree
Answer: C
Conceptual Explanation: A discrete variable has countable values, such as the number of
students, whereas weights, times, and heights are continuous.
2. What measure of center is most sensitive to extreme outliers?
A. Mode
B. Median
C. Mean
D. Interquartile range
,Answer: C
Conceptual Explanation: The mean takes every value into account, making it heavily
influenced by extremely large or small values.
3. In a standard normal distribution, what is the mean and standard deviation?
A. Mean = 1, Standard Deviation = 0
B. Mean = 100, Standard Deviation = 15
C. Mean = 0, Standard Deviation = 1
D. Mean = 0, Standard Deviation = 0
Answer: C
Conceptual Explanation: By definition, the standard normal distribution always has a
mean of 0 and a standard deviation of 1.
4. What type of graph is best suited for showing the relationship between two quantitative
variables?
A. Pie chart
B. Bar chart
C. Scatterplot
D. Boxplot
Answer: C
, Conceptual Explanation: Scatterplots use Cartesian coordinates to display values for
typically two variables for a set of data.
5. If the correlation coefficient (r) is -0.85, what does this indicate about the relationship
between the two variables?
A. Strong positive linear relationship
B. Weak positive linear relationship
C. Strong negative linear relationship
D. Weak negative linear relationship
Answer: C
Conceptual Explanation: A value close to -1 indicates a strong negative linear association.
6. What is the sum of all probabilities in a discrete probability distribution?
A. 0
B. 0.5
C. 1
D. It depends on the sample size
Answer: C
Conceptual Explanation: A fundamental rule of probability is that the sum of all
probabilities in a sample space must equal 1.
