Chapter 3 Probability

Chapter 3
Probability

True/False

1. A contingency table is a tabular summary of probabilities concerning two sets of complementary events.
Answer: True Difficulty: Medium

2. An event is a collection of sample space outcomes.
Answer: True Difficulty: Easy

3. Two events are independent if the probability of one event is influenced by whether or not the other event occurs.
Answer: False Difficulty: Medium

4. Mutually exclusive events have a nonempty intersection.
Answer: False Difficulty: Medium (REF)

5. A subjective probability is a probability assessment that is based on experience, intuitive judgment, or expertise.
Answer: True Difficulty: Medium

6. The probability
In which of the following are the two events A and B, always independent?
A) A and B are mutually exclusive.
B) The probability of event A is not influenced by the probability of event B.
C) The intersection of A and B is zero.
D) P(A/B) = P(A).
E) B and D.
Answer: E Difficulty: Hard (REF)

15. If two events are independent, we can _____ their probabilities to determine the intersection probability.
A) Divide
B) Add
C) Multiply
D) Subtract
Answer: C Difficulty: Easy

16. Events that have no sample space outcomes in common, and therefore, cannot occur simultaneously are:
A) Independent
B) Mutually Exclusive
C) Intersections
D) Unions
Answer: B Difficulty: Medium

17. If events A and B are independent, then the probability of simultaneous occurrence of event A and event B can be found with:
A) P(A)•P(B)
B) P(A)•P( )
C) P(B)•P( )
D) All of the above are correct
Answer: D Difficulty: Hard (REF)

18. The set of all possible experimental outcomes is called a(n):
A) Sample space
B) Event
C) Experiment
D) Probability
Answer: A Difficulty: