C785 Applied Healthcare Statistics - Week 7 Quiz 2026 |WGU
1. What is the probability of an event that is certain to occur?
A. 0.0
B. 1.0
C. 0.5
D. -1.0
Answer: B
Rationale: Probability is measured on a scale from 0 to 1, where 1.0 represents certainty.
2. If two events cannot occur at the same time, they are called:
A. Independent
B. Dependent
C. Mutually Exclusive
D. Conditional
Answer: C
Rationale: Mutually exclusive events are events that have no outcomes in common and
cannot happen simultaneously.
3. Which rule is used to find the probability of one event OR another event
occurring?
A. The Multiplication Rule
B. The Division Rule
C. The Addition Rule
D. The Subtraction Rule
Answer: C
,Rationale: The Addition Rule is used to calculate the probability of the union of two events
(A or B).
4. What is the Z-score for a value that is exactly equal to the mean?
A. 1.0
B. Undefined
C. -1.0
D. 0.0
Answer: D
Rationale: A Z-score measures how many standard deviations a value is from the mean. If
the value equals the mean, the distance is zero.
5. In a normal distribution, what percentage of data falls within 2 standard
deviations of the mean?
A. 68%
B. 95%
C. 99.7%
D. 50%
Answer: B
Rationale: According to the Empirical Rule, approximately 95% of data in a normal
distribution falls within 2 standard deviations.
6. The set of all possible outcomes for an experiment is called the:
A. Population
B. Event Set
C. Sample Space
D. Probability Distribution
Answer: C
Rationale: The sample space contains every possible result of a random experiment.
, 7. Which type of probability is based on personal judgment or intuition?
A. Empirical Probability
B. Classical Probability
C. Subjective Probability
D. Theoretical Probability
Answer: C
Rationale: Subjective probability is an estimate based on experience or personal opinion
rather than data or logic.
8. If the probability of event A is 0.3, what is the probability of the complement
of A?
A. 0.3
B. 0.7
C. 1.3
D. 0.0
Answer: B
Rationale: The probability of a complement is 1 minus the probability of the event (1 - 0.3
= 0.7).
9. Which rule applies when calculating the probability of event A AND event B
occurring?
A. Logarithmic Rule
B. Addition Rule
C. Square Root Rule
D. Multiplication Rule
Answer: D
Rationale: The Multiplication Rule is used to find the intersection of two events (A and B).
1. What is the probability of an event that is certain to occur?
A. 0.0
B. 1.0
C. 0.5
D. -1.0
Answer: B
Rationale: Probability is measured on a scale from 0 to 1, where 1.0 represents certainty.
2. If two events cannot occur at the same time, they are called:
A. Independent
B. Dependent
C. Mutually Exclusive
D. Conditional
Answer: C
Rationale: Mutually exclusive events are events that have no outcomes in common and
cannot happen simultaneously.
3. Which rule is used to find the probability of one event OR another event
occurring?
A. The Multiplication Rule
B. The Division Rule
C. The Addition Rule
D. The Subtraction Rule
Answer: C
,Rationale: The Addition Rule is used to calculate the probability of the union of two events
(A or B).
4. What is the Z-score for a value that is exactly equal to the mean?
A. 1.0
B. Undefined
C. -1.0
D. 0.0
Answer: D
Rationale: A Z-score measures how many standard deviations a value is from the mean. If
the value equals the mean, the distance is zero.
5. In a normal distribution, what percentage of data falls within 2 standard
deviations of the mean?
A. 68%
B. 95%
C. 99.7%
D. 50%
Answer: B
Rationale: According to the Empirical Rule, approximately 95% of data in a normal
distribution falls within 2 standard deviations.
6. The set of all possible outcomes for an experiment is called the:
A. Population
B. Event Set
C. Sample Space
D. Probability Distribution
Answer: C
Rationale: The sample space contains every possible result of a random experiment.
, 7. Which type of probability is based on personal judgment or intuition?
A. Empirical Probability
B. Classical Probability
C. Subjective Probability
D. Theoretical Probability
Answer: C
Rationale: Subjective probability is an estimate based on experience or personal opinion
rather than data or logic.
8. If the probability of event A is 0.3, what is the probability of the complement
of A?
A. 0.3
B. 0.7
C. 1.3
D. 0.0
Answer: B
Rationale: The probability of a complement is 1 minus the probability of the event (1 - 0.3
= 0.7).
9. Which rule applies when calculating the probability of event A AND event B
occurring?
A. Logarithmic Rule
B. Addition Rule
C. Square Root Rule
D. Multiplication Rule
Answer: D
Rationale: The Multiplication Rule is used to find the intersection of two events (A and B).
