# Descriptive Statistics and Data Analysis

June 13, 2018

41)
Which of the following is included in the empirical rules?
A)
Approximately 59% of the observations will fall within two standard deviations
of the mean, or within x ± 2s.
B)
Approximately 68% of the observations will fall within one standard deviation
of the mean, or between x – s and x + s.
C)
Approximately 89% of the observations will fall within three standard
deviations of the mean, or within x ± 3s.
D)
Approximately 28% of the observations will fall within three standard
deviations of the mean, or within x ± 3s.

42)
According to the empirical rules, approximately 99.7% of the observations will
fall within ________.
A)
one standard deviation of the mean
B)
two standard deviations of the mean
C)
three standard deviations of the mean
D)
four standard deviations of the mean

43)
According to the empirical rules, approximately 95% of the observations will
fall within ________.
A)
one standard deviation of the mean
B)
two standard deviations of the mean
C)
three standard deviations of the mean
D)
four standard deviations of the mean

44)
The ________ is used to compare the variability of two or more data sets with
different scales.
A)
coefficient of variation
B)
variance
C)
median
D)
coefficient of skewness

45)
The coefficient of variation (CV) is calculated as ________.
A) mode/standard deviation
B) standard deviation/mean
C) standard deviation/variance
D) range/standard deviation

46)
Given that the standard deviation is equal to 0.568, the median equals 5, and
the mean value is 3.5, what is the value of the coefficient of variation?
A)
0.1136
B)
0.162
C)
6.16
D)
0.7

47)
When more of the mass of the data is concentrated on one side and the
distribution of values tails off to the other side, the histogram is said to be
________.
A)
symmetric
B)
skewed
C)
curved
D)
positively sloped

48)
When a histogram is positively skewed, it ________.
A)
tails off to the right
B)
is symmetrical
C)
tails off to the left
D)
has a slope greater than one

49)
When a histogram is negatively skewed, it ________.
A)
is symmetrical
B)
tails off to the left
C)
has a slope lesser than one
D)
tails off to the right

50)
The degree of asymmetry of observations around the mean is measured by the
________.
A)
coefficient of correlation
B)
coefficient of symmetry
C)
coefficient of skewness
D)
coefficient of deviation

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