CHAMBERLAIN COLLEGE OF
NURSING: MATH 225N STATISTICAL
REASONING EXAM QUESTIONS AND
VERIFIED ANSWERS |100% CORRECT|
GRADE A+
1. A researcher is studying the effects of a new medication on blood pressure. They select
every 5th patient from a list of clinic attendees. What sampling method is being used?
A. Cluster Sampling
B. Systematic Sampling
C. Stratified Sampling
D. Convenience Sampling
Answer: B
Conceptual Explanation: Systematic sampling involves selecting members of a population
at a regular interval, such as every ‘k-th’ individual.
2. Which level of measurement is characterized by data that can be ordered, but the
differences between data entries are not meaningful?
A. Nominal
B. Ordinal
,C. Interval
D. Ratio
Answer: B
Conceptual Explanation: Ordinal data can be ranked or ordered (e.g., patient satisfaction
levels), but the mathematical difference between ranks is not defined or meaningful.
3. In a skewed-right distribution, which of the following relationships between the mean and
median is typically true?
A. The mean is less than the median.
B. The mean is greater than the median.
C. The mean and median are equal.
D. The median is equal to the mode.
Answer: B
Conceptual Explanation: In a right-skewed distribution, the tail pulls the mean toward
the higher values, making it larger than the median.
4. If the variance of a dataset is 64, what is the standard deviation?
A. 32
B. 16
C. 8
, D. 4096
Answer: C
Conceptual Explanation: The standard deviation is the square root of the variance. The
square root of 64 is 8.
5. Which of the following represents a quantitative discrete variable?
A. The weight of a newborn baby
B. The number of patients admitted to the ER in one day
C. The temperature of a hospital room
D. The time it takes for a wound to heal
Answer: B
Conceptual Explanation: Discrete variables represent countable values. You can count the
number of patients, but weight, temperature, and time are continuous measurements.
6. According to the Empirical Rule, what percentage of data falls within two standard
deviations of the mean in a normal distribution?
A. 95%
B. 90%
C. 68%
D. 99.7%
NURSING: MATH 225N STATISTICAL
REASONING EXAM QUESTIONS AND
VERIFIED ANSWERS |100% CORRECT|
GRADE A+
1. A researcher is studying the effects of a new medication on blood pressure. They select
every 5th patient from a list of clinic attendees. What sampling method is being used?
A. Cluster Sampling
B. Systematic Sampling
C. Stratified Sampling
D. Convenience Sampling
Answer: B
Conceptual Explanation: Systematic sampling involves selecting members of a population
at a regular interval, such as every ‘k-th’ individual.
2. Which level of measurement is characterized by data that can be ordered, but the
differences between data entries are not meaningful?
A. Nominal
B. Ordinal
,C. Interval
D. Ratio
Answer: B
Conceptual Explanation: Ordinal data can be ranked or ordered (e.g., patient satisfaction
levels), but the mathematical difference between ranks is not defined or meaningful.
3. In a skewed-right distribution, which of the following relationships between the mean and
median is typically true?
A. The mean is less than the median.
B. The mean is greater than the median.
C. The mean and median are equal.
D. The median is equal to the mode.
Answer: B
Conceptual Explanation: In a right-skewed distribution, the tail pulls the mean toward
the higher values, making it larger than the median.
4. If the variance of a dataset is 64, what is the standard deviation?
A. 32
B. 16
C. 8
, D. 4096
Answer: C
Conceptual Explanation: The standard deviation is the square root of the variance. The
square root of 64 is 8.
5. Which of the following represents a quantitative discrete variable?
A. The weight of a newborn baby
B. The number of patients admitted to the ER in one day
C. The temperature of a hospital room
D. The time it takes for a wound to heal
Answer: B
Conceptual Explanation: Discrete variables represent countable values. You can count the
number of patients, but weight, temperature, and time are continuous measurements.
6. According to the Empirical Rule, what percentage of data falls within two standard
deviations of the mean in a normal distribution?
A. 95%
B. 90%
C. 68%
D. 99.7%
