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Quiz 2
 Measures of central tendency
 Measures of variability
1. Which measure of central
tendency divides a sample into two
parts of equal size (i.e., n/2)?
a) arithmetic mean
b) median
c) mode
d) midrange
2.What is the coefficient of
variation for a test with mean 25
and SD 10?
a) 40%
b) 10%
c) 25%
d) 2.5%
3. Compute the z-score for a test
score of 35 from a test that had a
mean of 50 and SD of 10.
a) 1.5
b) 3.5
c) -3.5
d) -1.5
4. Given a z-score of 1.20 what
was the test score on a test
with mean of 40 and SD of 12?
a) 14.4
b) 52.0
c) 54.4
d) 25.6
5. In normally distributed data
approximately ____% of scores
lie within +/–1 SD of the mean?
a) 50
b) 68
c) 95
d) 99
6. Which phrase best describes
the following distribution?
a) negatively skewed
b) positively skewed
c) normally distributed
7. What is the median of the
following ordered list of numbers?
23, 45, 66, 67, 68, 80, 102
a) 64.4
b) 66.5
c) 67.0
d) 67.5
8. Standard deviation is defined
as the _________.
a) square root of the variance
b) square of the variance
c) mean divided by the variance
d) range divided by 2
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