Psy302 Quantitative Methods
QUIZ CHAPTER FOUR
1. Variability is a measure of:
A. spread
B. central tendency
C. popularity
D. the middle
E. all of the above
1. Variability is a measure of:
A. spread
B. central tendency
C. popularity
D. the middle
E. all of the above
2. The ____ is the simplest way to describe
how dispersed or spread out scores are. It
involves the difference between the largest
value and the smallest value.
A. mean
B. range
C. mode
D. standard deviation
E. sum of squares
2. The ____ is the simplest way to describe
how dispersed or spread out scores are. It
involves the difference between the largest
value and the smallest value.
A. mean
B. range
C. mode
D. standard deviation
E. sum of squares
3. The range is seldom used as a primary
measure of variability in research because:
A. it is difficult to
B.
C.
D.
E.
compute
it is highly skewed
it measures central
tendency
it is based on two
values
all of the above
3. The range is seldom used as a primary
measure of variability in research because:
A. it is difficult to
B.
C.
D.
E.
compute
it is highly skewed
it measures central
tendency
it is based on two
values
all of the above
4. The mean is not used as a primary measure
of variability in research because:
A. it is difficult to
B.
C.
D.
E.
compute
it is highly skewed
it measures central
tendency
it is based on two
values
all of the above
4. The mean is not used as a primary measure
of variability in research because:
A. it is difficult to
B.
C.
D.
E.
compute
it is highly skewed
it measures central
tendency
it is based on two
values
all of the above
5. Which of the following is an example of a
distribution with NO variability?
A. scores: 3, 5, 4, 4, 5, and 3
B. scores: 3, 3, 3, 3, 33, and 3
C. scores: 1, 2, 3, 4, 5, and 6
D. scores: 5, 5, 5, 5, 5, and 5
5. Which of the following is an example of a
distribution with NO variability?
A. scores: 3, 5, 4, 4, 5, and 3
B. scores: 3, 3, 3, 3, 33, and 3
C. scores: 1, 2, 3, 4, 5, and 6
D. scores: 5, 5, 5, 5, 5, and 5
6. The degrees of freedom for the sample
variance:
A. are equal to the
sample size
B. are equal to the
sample size minus
one
C. can vary between –
and +
D. both B and C
6. The degrees of freedom for the sample
variance:
A. are equal to the
sample size
B. are equal to the
sample size minus
one
C. can vary between –
and +
D. both B and C
7. Which of the following is true?
A. the standard deviation measures central
B.
C.
D.
E.
tendency
the mean measures variability
the standard deviation is always positive
the standard deviation is used to describe
qualitative data
all of the above
7. Which of the following is true?
A. the standard deviation measures central
B.
C.
D.
E.
tendency
the mean measures variability
the standard deviation is always positive
the standard deviation is used to describe
qualitative data
all of the above
8. Which of the following is a measure of
spread or variability?
A. mean
B. ogive
C. variance
D. square root
E. skewness
8. Which of the following is a measure of
spread or variability?
A. mean
B. ogive
C. variance
D. square root
E. skewness
9. Which shows more size variablity, the 6
boats or the 15 ducklings?
A. the boats
B. the ducks
C. they are the same
D. all of the above
9. Which shows more size variablity, the 6
boats or the 15 ducklings?
A. the boats
B. the ducks
C. they are the same
D. all of the above
10. The empirical rule states that for any
normally distributed set of data, 99.7% of
values lie within ____ of the mean.
A. 3 standard deviations
B. 6 raw score units
C. range
D. sight
E. all of the above
10. The empirical rule states that for any
normally distributed set of data, 99.7% of
values lie within ____ of the mean.
A. 3 standard
deviations
B. 6 raw score units
C. range
D. sight
E. all of the above
The End