WGU C784 APPLIED PROBABILITY AND
STATISTICS FINAL EXAM PREP
1. Which of the following describes a ‘Ratio’ level of measurement?
A. Data with consistent intervals and a true zero point where zero means the absence of the
trait.
B. Data that can be ranked but has no consistent difference between values.
C. Data with consistent intervals between values but no true zero point.
D. Data that can be categorized but not ranked.
Answer: A
Conceptual Explanation: Ratio data has all the properties of interval data, plus a
meaningful zero point, allowing for statements about ‘twice as much.’
2. A researcher wants to study the average height of all adults in the United States but only
measures 1,000 people. The 1,000 people measured are the:
A. Sample
B. Population
C. Parameter
,D. Statistic
Answer: A
Conceptual Explanation: The sample is the specific group of individuals from whom data
is actually collected to represent a larger population.
3. In a dataset with a significant number of high-value outliers, which measure of central
tendency is most likely to be higher than the others?
A. Mode
B. Median
C. Mean
D. Interquartile Range
Answer: C
Conceptual Explanation: The mean is sensitive to outliers. High-value outliers pull the
mean toward the right, making it higher than the median or mode.
4. Which sampling method involves dividing the population into groups based on a
characteristic and then taking a random sample from each group?
A. Systematic Sampling
B. Cluster Sampling
C. Convenience Sampling
D. Stratified Sampling
, Answer: D
Conceptual Explanation: Stratified sampling ensures representation from different
subgroups (strata) by sampling within each one.
5. What is the probability of an event that is certain to occur?
A. 0
B. 0.5
C. 100
D. 1
Answer: D
Conceptual Explanation: Probability is measured on a scale from 0 to 1. An event that is
certain to occur has a probability of 1.
6. If the correlation coefficient (r) between two variables is -0.95, what does this indicate?
A. A strong negative linear relationship
B. A weak negative linear relationship
C. A weak positive linear relationship
D. No linear relationship
Answer: A
STATISTICS FINAL EXAM PREP
1. Which of the following describes a ‘Ratio’ level of measurement?
A. Data with consistent intervals and a true zero point where zero means the absence of the
trait.
B. Data that can be ranked but has no consistent difference between values.
C. Data with consistent intervals between values but no true zero point.
D. Data that can be categorized but not ranked.
Answer: A
Conceptual Explanation: Ratio data has all the properties of interval data, plus a
meaningful zero point, allowing for statements about ‘twice as much.’
2. A researcher wants to study the average height of all adults in the United States but only
measures 1,000 people. The 1,000 people measured are the:
A. Sample
B. Population
C. Parameter
,D. Statistic
Answer: A
Conceptual Explanation: The sample is the specific group of individuals from whom data
is actually collected to represent a larger population.
3. In a dataset with a significant number of high-value outliers, which measure of central
tendency is most likely to be higher than the others?
A. Mode
B. Median
C. Mean
D. Interquartile Range
Answer: C
Conceptual Explanation: The mean is sensitive to outliers. High-value outliers pull the
mean toward the right, making it higher than the median or mode.
4. Which sampling method involves dividing the population into groups based on a
characteristic and then taking a random sample from each group?
A. Systematic Sampling
B. Cluster Sampling
C. Convenience Sampling
D. Stratified Sampling
, Answer: D
Conceptual Explanation: Stratified sampling ensures representation from different
subgroups (strata) by sampling within each one.
5. What is the probability of an event that is certain to occur?
A. 0
B. 0.5
C. 100
D. 1
Answer: D
Conceptual Explanation: Probability is measured on a scale from 0 to 1. An event that is
certain to occur has a probability of 1.
6. If the correlation coefficient (r) between two variables is -0.95, what does this indicate?
A. A strong negative linear relationship
B. A weak negative linear relationship
C. A weak positive linear relationship
D. No linear relationship
Answer: A
