Psych 311 Exam Questions With
New Update Solutions A+ Pass
A news poll showed that voters had no preference for any of the three candidates.
In this example, the probability of a vote for, say, Candidate A equals
A) 1/2
B) 1/3
C) 2/3
D) 1.00 - CORRECT ANSWER-1/3
,Suppose that the probability that any child of alcoholic parents becomes alcoholic
is p = .16. Assuming independent outcomes, the probability that two children of
alcoholic parents will be alcoholic equals
A) .16
B) .32
C) .03
D) .25 - CORRECT ANSWER-.03
Two outcomes are said to be mutually exclusive when
A) the probability of the two outcomes occurring together is equal to zero (p = 0)
B) the probability of the occurrence of one outcome has no effect on the
probability of the occurrence of the second outcome
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
,C) the probability of the two outcomes occurring together is greater than zero (p >
0)
D) the probability of the two outcomes occurring together sums to one -
CORRECT ANSWER-the probability of the two outcomes occurring together is
equal to zero (p = 0)
The proportion or fraction of times an outcome is likely to occur is referred to as
A) probability
B) a random event
C) sample space
D) luck - CORRECT ANSWER-probability
A therapist goes through her records and finds that 200 of her 400 patients showed
significant improvement in mental health over the past year. Hence, the probability
of her patients showing significant improvement in mental health is
, A) .05
B) .50
C) 200
D) 400 - CORRECT ANSWER-.50
A researcher records the following data for the number of bids made on a sample
of items sold at an auction. Based on the table, what was the probability that an
item had 7 bids made on it?
Number of Bids Frequencies
35
4 12
57
66
7 10
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
New Update Solutions A+ Pass
A news poll showed that voters had no preference for any of the three candidates.
In this example, the probability of a vote for, say, Candidate A equals
A) 1/2
B) 1/3
C) 2/3
D) 1.00 - CORRECT ANSWER-1/3
,Suppose that the probability that any child of alcoholic parents becomes alcoholic
is p = .16. Assuming independent outcomes, the probability that two children of
alcoholic parents will be alcoholic equals
A) .16
B) .32
C) .03
D) .25 - CORRECT ANSWER-.03
Two outcomes are said to be mutually exclusive when
A) the probability of the two outcomes occurring together is equal to zero (p = 0)
B) the probability of the occurrence of one outcome has no effect on the
probability of the occurrence of the second outcome
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
,C) the probability of the two outcomes occurring together is greater than zero (p >
0)
D) the probability of the two outcomes occurring together sums to one -
CORRECT ANSWER-the probability of the two outcomes occurring together is
equal to zero (p = 0)
The proportion or fraction of times an outcome is likely to occur is referred to as
A) probability
B) a random event
C) sample space
D) luck - CORRECT ANSWER-probability
A therapist goes through her records and finds that 200 of her 400 patients showed
significant improvement in mental health over the past year. Hence, the probability
of her patients showing significant improvement in mental health is
, A) .05
B) .50
C) 200
D) 400 - CORRECT ANSWER-.50
A researcher records the following data for the number of bids made on a sample
of items sold at an auction. Based on the table, what was the probability that an
item had 7 bids made on it?
Number of Bids Frequencies
35
4 12
57
66
7 10
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
