PSYD 719 Sample review questions for Quiz 1 Part B
Z-Score
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. A z-score of z = 2.00 indicates a position in a distribution __________.
a. above the mean by 2 points
b. above the mean by a distance equal to 2 standard deviations
c. below the mean by 2 points
d. below the mean by a distance equal to 2 standard deviations
____
2. For a population with
a. +0.50
b. +1.00
c. +2.00
d. +5.00
____
3. A population of scores has = 50. In this population, an X value of 60 corresponds to z = 2.00. What is the
population standard deviation?
a. 8
b. 4
c. 5
d. 10
____
4. Of the following z-score values, which one represents the most extreme location on the left-hand side of the
distribution?
a. z = +1.00
b. z = +2.00
c. z = 1.00
d. z = 2.00
5. Of the following z-score values, which one represents the location closest to the mean?
a. z = +0.50
b. z = +1.00
c. z = 1.00
d. z = 2.00
6. For a population with = 100 and = 20, what is the z-score corresponding to X = 105?
a. +0.25
b. +0.50
c. +4.00
d. +5.00
7. For a population with = 80 and = 10, what is the z-score corresponding to X = 85?
a. +0.50
b. +1.00
c. +2.00
d. +5.00
8. For a population with = 80 and = 10, what is the z-score corresponding to X = 70?
a. 10
b. 1.00
c. +1.00
d. +10
9. For a population with = 60 and = 8, what is the X value corresponding to z = 1.50?
____
____
____
____
____
= 80 and
= 10, what is the z-score corresponding to X = 85?
____ 10.
____ 11.
____ 12.
____ 13.
____ 14.
____ 15.
____ 16.
____ 17.
a. 12
b. 61.5
c. 72
d. 90
A population of scores has = 42. In this population, an X value of 40 corresponds to z = 0.50. What is the
population standard deviation?
a. 4
b. 2
c. 4
d. 2
A population of scores has = 50. In this population, an X value of 58 corresponds to z = 2.00. What is the
population standard deviation?
a. 2
b. 4
c. 8
d. 16
A population of scores has = 20. In this population, a score of X = 80 corresponds to z = +0.25. What is the
population mean?
a. 70
b. 75
c. 85
d. 90
A population of scores has = 10. In this population, a score of X = 60 corresponds to z = 1.50. What is the
population mean?
a. 30
b. 45
c. 75
d. 90
In N = 25 games last season, the college basketball team averaged = 74 points with a standard deviation of
= 6. In their final game of the season, the team scored 90 points. Based on this information, the number of
points scored in the final game was __________.
a. a little above average
b. far above average
c. above average, but it is impossible to describe how much above average
d. There is not enough information to compare last year with the average.
Under what circumstances would a score that is 15 points above the mean be considered to be near the center
of the distribution?
a. when the population mean is much larger than 15
b. when the population standard deviation is much larger than 15
c. when the population mean is much smaller than 15
d. when the population standard deviation is much smaller than 15
A population has a standard deviation of = 6. In this distribution, a score that is 12 points above the mean
would correspond to a z-score of __________.
a. z = 1
b. z = 2
c. z = 6
d. z = 12
For a population with = 4, an individual with a deviation score of +2 would have a z-score of __________.
a. +2.00
b. +8.00
c. +0.50
d. cannot be determined without knowing the population mean
____ 18. Suppose you earned a score of X = 54 on an exam. Which set of parameters would give you the highest
grade?
a.
= 50 and = 2
b.
= 50 and = 8
c.
= 58 and = 2
d.
= 58 and = 8
____ 19. Suppose you earned a score of X = 45 on an exam. Which set of parameters would give you the highest
grade?
a.
= 50 and = 2
b.
= 50 and = 10
c.
= 55 and = 2
d.
= 55 and = 10
____ 20. Last week Sarah had exams in Math and in Spanish. She had a score of 45 on the Math exam and a score of
65 on the Spanish exam. For which class should Sarah expect the better grade?
a. Math
b. Spanish
c. The grades should be the same because the two exam scores are in the same location.
d. There is not enough information to determine which is the better grade.
Z Score
Answer
MULTIPLE CHOICE
1. ANS: B
2. ANS: A
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