Essentials of Statistics for Business and Economics 6Th Edition by David R. Anderson – Test Bank
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Sample Test
CHAPTER 3—DESCRIPTIVE STATISTICS: NUMERICAL MEASURES
MULTIPLE CHOICE
1. The
measure of location which is the most likely to be influenced by extreme values
in the data set is the
|
a. |
range |
|
b. |
median |
|
c. |
mode |
|
d. |
mean |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
2. The
most important statistical descriptive measure of the location of a data set is
the
|
a. |
mean |
|
b. |
median |
|
c. |
mode |
|
d. |
variance |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
3. If
two groups of numbers have the same mean, then
|
a. |
their standard deviations must also be
equal |
|
b. |
their medians must also be equal |
|
c. |
their modes must also be equal |
|
d. |
None of these alternatives is correct. |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
4. The
mean of the sample
|
a. |
is always smaller than the mean of the
population from which the sample was taken |
|
b. |
can never be zero |
|
c. |
can never be negative |
|
d. |
None of these alternatives is correct. |
ANS:
D
PTS: 1
TOP: Descriptive Statistics
5. When
the smallest and largest percentage of items are removed from a data set and
the mean is computed, the mean of the remaining data is
|
a. |
the median |
|
b. |
the mode |
|
c. |
the trimmed mean |
|
d. |
any of the above |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
6. Since
the population is always larger than the sample, the value of the sample mean
|
a. |
is always smaller than the true value
of the population mean |
|
b. |
is always larger than the true value of
the population mean |
|
c. |
is always equal to the true value of
the population mean |
|
d. |
could be larger, equal to, or smaller
than the true value of the population mean |
ANS:
D
PTS: 1
TOP: Descriptive Statistics
7. Which
of the following provides a measure of central location for the data?
|
a. |
standard deviation |
|
b. |
mean |
|
c. |
variance |
|
d. |
range |
ANS:
B
PTS: 1
TOP: Descriptive Statistics
8. When
computing the mean of a set of values xi, the
value of åxi
|
a. |
can never be zero |
|
b. |
can never be negative |
|
c. |
must always be positive |
|
d. |
can be any value |
ANS: D
PTS:
1
TOP: Descriptive Statistics
9. In
computing the mean of a sample, the value of åxi is
divided by
|
a. |
n |
|
b. |
n – 1 |
|
c. |
n + 1 |
|
d. |
n – 2 |
ANS:
A
PTS: 1
TOP: Descriptive Statistics
10.
A numerical value used as a summary measure for a sample, such
as sample mean, is known as a
|
a. |
population parameter |
|
b. |
sample parameter |
|
c. |
sample statistic |
|
d. |
population mean |
ANS: C
PTS:
1
TOP: Descriptive Statistics
11.
Since the population size is always larger than the sample size,
then the sample statistic
|
a. |
can never be larger than the population
parameter |
|
b. |
can never be equal to the population
parameter |
|
c. |
can be smaller, larger, or equal to the
population parameter |
|
d. |
can never be smaller than the
population parameter |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
12.
m is an example of a
|
a. |
population parameter |
|
b. |
sample statistic |
|
c. |
population variance |
|
d. |
mode |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
13.
The mean of a sample
|
a. |
is always equal to the mean of the population |
|
b. |
is always smaller than the mean of the
population |
|
c. |
is computed by summing the data values
and dividing the sum by (n – 1) |
|
d. |
is computed by summing all the data
values and dividing the sum by the number of items |
ANS: D
PTS:
1
TOP: Descriptive Statistics
14.
The hourly wages of a sample of 130 system analysts are given
below.
|
mean = 60 |
range = 20 |
|
mode = 73 |
variance = 324 |
|
median = 74 |
|
The coefficient of variation equals
|
a. |
0.30% |
|
b. |
30% |
|
c. |
5.4% |
|
d. |
54% |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
15.
The variance of a sample of 169 observations equals 576. The
standard deviation of the sample equals
|
a. |
13 |
|
b. |
24 |
|
c. |
576 |
|
d. |
28,461 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
16.
The median of a sample will always equal the
|
a. |
mode |
|
b. |
mean |
|
c. |
50th percentile |
|
d. |
all of the above answers are correct |
ANS: C
PTS:
1
TOP: Descriptive Statistics
17.
The median is a measure of
|
a. |
relative dispersion |
|
b. |
absolute dispersion |
|
c. |
central location |
|
d. |
relative location |
ANS:
C
PTS: 1
TOP: Descriptive Statistics
18.
The 50th percentile is the
|
a. |
mode |
|
b. |
median |
|
c. |
mean |
|
d. |
third quartile |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
19.
The 75th percentile is referred to as the
|
a. |
first quartile |
|
b. |
second quartile |
|
c. |
third quartile |
|
d. |
fourth quartile |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
20.
The pth
percentile is a value such that at least p percent of the observations are
|
a. |
less than or equal to this value |
|
b. |
less than this value |
|
c. |
more than or equal to this value |
|
d. |
more than this value |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
21.
The difference between the largest and the smallest data values
is the
|
a. |
variance |
|
b. |
interquartile range |
|
c. |
range |
|
d. |
coefficient of variation |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
22.
The first quartile
|
a. |
contains at least one third of the data
elements |
|
b. |
is the same as the 25th percentile |
|
c. |
is the same as the 50th percentile |
|
d. |
is the same as the 75th percentile |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
23.
When computing the mean, the smallest value
|
a. |
can never be negative |
|
b. |
can never be zero |
|
c. |
can never be less than the mean |
|
d. |
can be any value |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
24.
Which of the following is not a measure of central location?
|
a. |
mean |
|
b. |
median |
|
c. |
variance |
|
d. |
mode |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
25.
If a data set has an even number of observations, the median
|
a. |
cannot be determined |
|
b. |
is the average value of the two middle
items |
|
c. |
must be equal to the mean |
|
d. |
is the average value of the two middle
items when all items are arranged in ascending order |
ANS: D
PTS:
1
TOP: Descriptive Statistics
26.
Which of the following is a measure of dispersion?
|
a. |
percentiles |
|
b. |
quartiles |
|
c. |
interquartile range |
|
d. |
all of the above are measures of
dispersion |
ANS: C
PTS:
1
TOP: Descriptive Statistics
27.
The value which has half of the observations above it and half
the observations below it is called the
|
a. |
range |
|
b. |
median |
|
c. |
mean |
|
d. |
mode |
ANS: B
PTS:
1
TOP: Descriptive Statistics
28.
The most frequently occurring value of a data set is called the
|
a. |
range |
|
b. |
mode |
|
c. |
mean |
|
d. |
median |
ANS:
B
PTS: 1
TOP: Descriptive Statistics
29.
The interquartile range is
|
a. |
the 50th percentile |
|
b. |
another name for the variance |
|
c. |
the difference between the largest and
smallest values |
|
d. |
the difference between the third
quartile and the first quartile |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
30.
The weights (in pounds) of a sample of 36 individuals were
recorded and the following statistics were calculated.
|
mean = 160 |
range = 60 |
|
mode = 165 |
variance = 324 |
|
median = 170 |
|
The coefficient of variation equals
|
a. |
0.1125% |
|
b. |
11.25% |
|
c. |
203.12% |
|
d. |
0.20312% |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
31.
The heights (in inches) of 25 individuals were recorded and the
following statistics were calculated
|
mean = 70 |
range = 20 |
|
mode = 73 |
variance = 784 |
|
median = 74 |
|
The coefficient of variation equals
|
a. |
11.2% |
|
b. |
1120% |
|
c. |
0.4% |
|
d. |
40% |
ANS: D
PTS:
1
TOP: Descriptive Statistics
32.
The standard deviation of a sample of 100 observations equals
64. The variance of the sample equals
|
a. |
8 |
|
b. |
10 |
|
c. |
6400 |
|
d. |
4,096 |
ANS: D
PTS:
1
TOP: Descriptive Statistics
33.
The variance of a sample of 81 observations equals 64. The
standard deviation of the sample equals
|
a. |
9 |
|
b. |
4096 |
|
c. |
8 |
|
d. |
6561 |
ANS: C
PTS:
1
TOP: Descriptive Statistics
34.
If index i (which
is used to determine the location of the pth percentile) is not an integer, its
value should be
|
a. |
squared |
|
b. |
divided by (n – 1) |
|
c. |
rounded down |
|
d. |
rounded up |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
35.
When the data are skewed to the right, the measure of Skewness
will be
|
a. |
negative |
|
b. |
zero |
|
c. |
positive |
|
d. |
one |
ANS: C
PTS:
1
TOP: Descriptive Statistics
36.
When data are positively skewed, the mean will usually be
|
a. |
greater than the median |
|
b. |
smaller than the median |
|
c. |
equal to the median |
|
d. |
positive |
ANS: A
PTS:
1
TOP: Descriptive Statistics
37.
Which of the following is not a measure of dispersion?
|
a. |
the range |
|
b. |
the 50th percentile |
|
c. |
the standard deviation |
|
d. |
the interquartile range |
ANS: B
PTS:
1
TOP: Descriptive Statistics
38.
The interquartile range is used as a measure of variability to
overcome what difficulty of the range?
|
a. |
the sum of the range variances is zero |
|
b. |
the range is difficult to compute |
|
c. |
the range is influenced too much by
extreme values |
|
d. |
the range is negative |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
39.
If the variance of a data set is correctly computed with the
formula using n – 1 in the denominator, which of the following is true?
|
a. |
the data set is a sample |
|
b. |
the data set is a population |
|
c. |
the data set could be either a sample
or a population |
|
d. |
the data set is from a census |
ANS: A
PTS:
1
TOP: Descriptive Statistics
40.
In computing descriptive statistics from grouped data,
|
a. |
data values are treated as if they
occur at the midpoint of a class |
|
b. |
the grouped data result is more accurate
than the ungrouped result |
|
c. |
the grouped data computations are used
only when a population is being analyzed |
|
d. |
None of these alternatives is correct. |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
41.
The measure of dispersion that is influenced most by extreme
values is
|
a. |
the variance |
|
b. |
the standard deviation |
|
c. |
the range |
|
d. |
the interquartile range |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
42.
When should measures of location and dispersion be computed from
grouped data rather than from individual data values?
|
a. |
as much as possible since computations
are easier |
|
b. |
only when individual data values are
unavailable |
|
c. |
whenever computer packages for
descriptive statistics are unavailable |
|
d. |
only when the data are from a
population |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
43.
The descriptive measure of dispersion that is based on the
concept of a deviation about the mean is
|
a. |
the range |
|
b. |
the interquartile range |
|
c. |
the absolute value of the range |
|
d. |
the standard deviation |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
44.
The numerical value of the standard deviation can never be
|
a. |
larger than the variance |
|
b. |
zero |
|
c. |
negative |
|
d. |
smaller than the variance |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
45.
The sample variance
|
a. |
is always smaller than the true value
of the population variance |
|
b. |
is always larger than the true value of
the population variance |
|
c. |
could be smaller, equal to, or larger
than the true value of the population variance |
|
d. |
can never be zero |
ANS: C
PTS:
1
TOP: Descriptive Statistics
46.
The coefficient of variation is
|
a. |
the same as the variance |
|
b. |
the standard deviation divided by the
mean times 100 |
|
c. |
the square of the standard deviation |
|
d. |
the mean divided by the standard
deviation |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
47.
The variance can never be
|
a. |
zero |
|
b. |
larger than the standard deviation |
|
c. |
negative |
|
d. |
smaller than the standard deviation |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
48.
The sum of deviations of the individual data elements from their
mean is
|
a. |
always greater than zero |
|
b. |
always less than zero |
|
c. |
sometimes greater than and sometimes
less than zero, depending on the data elements |
|
d. |
always equal to zero |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
49.
Which of the following symbols represents the standard deviation
of the population?
|
a. |
s2 |
|
b. |
s |
|
c. |
m |
|
d. |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
50.
Which of the following symbols represents the mean of the
population?
|
a. |
s2 |
|
b. |
s |
|
c. |
m |
|
d. |
ANS: C
PTS:
1
TOP: Descriptive Statistics
51.
Which of the following symbols represents the variance of the
population?
|
a. |
s2 |
|
b. |
s |
|
c. |
m |
|
d. |
ANS:
A
PTS: 1
TOP: Descriptive Statistics
52.
Which of the following symbols represents the size of the
population?
|
a. |
s2 |
|
b. |
s |
|
c. |
m |
|
d. |
N |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
53.
Which of the following symbols represents the mean of the
sample?
|
a. |
s2 |
|
b. |
s |
|
c. |
m |
|
d. |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
54.
Which of the following symbols represents the size of the sample
|
a. |
s2 |
|
b. |
s |
|
c. |
N |
|
d. |
n |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
55.
The symbol s is used to represent
|
a. |
the variance of the population |
|
b. |
the standard deviation of the sample |
|
c. |
the standard deviation of the population |
|
d. |
the variance of the sample |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
56.
The symbol s2 is
used to represent
|
a. |
the variance of the population |
|
b. |
the standard deviation of the sample |
|
c. |
the standard deviation of the
population |
|
d. |
the variance of the sample |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
57.
The variance of the sample
|
a. |
can never be negative |
|
b. |
can be negative |
|
c. |
cannot be zero |
|
d. |
cannot be less than one |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
58.
The measure of dispersion which is not measured in the same
units as the original data is the
|
a. |
median |
|
b. |
standard deviation |
|
c. |
coefficient of determination |
|
d. |
variance |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
59.
A numerical measure of linear association between two variables
is the
|
a. |
variance |
|
b. |
covariance |
|
c. |
standard deviation |
|
d. |
coefficient of variation |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
60.
Positive values of covariance indicate
|
a. |
a positive variance of the x values |
|
b. |
a positive variance of the y values |
|
c. |
the standard deviation is positive |
|
d. |
positive relation between the
independent and the dependent variables |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
61.
A numerical measure of linear association between two variables
is the
|
a. |
variance |
|
b. |
coefficient of variation |
|
c. |
correlation coefficient |
|
d. |
standard deviation |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
62.
The coefficient of correlation ranges between
|
a. |
0 and 1 |
|
b. |
-1 and +1 |
|
c. |
minus infinity and plus infinity |
|
d. |
1 and 100 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
63.
The coefficient of correlation
|
a. |
is the same as the coefficient of determination |
|
b. |
can be larger than 1 |
|
c. |
cannot be larger than 1 |
|
d. |
cannot be negative |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
64.
The value of the sum of the deviations from the mean, i.e.,
must always be
|
a. |
less than the zero |
|
b. |
negative |
|
c. |
either positive or negative depending
on whether the mean is negative or positive |
|
d. |
zero |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
65.
The numerical value of the variance
|
a. |
is always larger than the numerical
value of the standard deviation |
|
b. |
is always smaller than the numerical
value of the standard deviation |
|
c. |
is negative if the mean is negative |
|
d. |
can be larger or smaller than the
numerical value of the standard deviation |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
66.
Since the median is the middle value of a data set it
|
a. |
must always be smaller than the mode |
|
b. |
must always be larger than the mode |
|
c. |
must always be smaller than the mean |
|
d. |
None of these alternatives is correct. |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
67.
In a five number summary, which of the following is not used for
data summarization?
|
a. |
the smallest value |
|
b. |
the largest value |
|
c. |
the mean |
|
d. |
the 25th percentile |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
68.
The relative frequency of a class is computed by
|
a. |
dividing the midpoint of the class by
the sample size |
|
b. |
dividing the frequency of the class by
the midpoint |
|
c. |
dividing the sample size by the
frequency of the class |
|
d. |
dividing the frequency of the class by
the sample size |
ANS:
D
PTS: 1
TOP: Descriptive Statistics
69.
During a cold winter, the temperature stayed below zero for ten
days (ranging from -20 to -5). The variance of the temperatures of the ten-day
period
|
a. |
is negative since all the numbers are
negative |
|
b. |
must be at least zero |
|
c. |
cannot be computed since all the
numbers are negative |
|
d. |
can be either negative or positive |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
70.
Which of the following is not a measure of dispersion?
|
a. |
mode |
|
b. |
standard deviation |
|
c. |
range |
|
d. |
interquartile range |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
71.
If the coefficient of variation is 40% and the mean is 70, then
the variance is
|
a. |
28 |
|
b. |
2800 |
|
c. |
1.75 |
|
d. |
784 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
72.
Given the following information:
Standard deviation = 8
Coefficient of variation = 64%
The mean would then be
|
a. |
12.5 |
|
b. |
8 |
|
c. |
0.64 |
|
d. |
1.25 |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
73.
Since the mode is the most frequently occurring data value, it
|
a. |
can never be larger than the mean |
|
b. |
is always larger than the median |
|
c. |
is always larger than the mean |
|
d. |
None of these alternatives is correct. |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
74.
A group of students had dinner at a local restaurant. The
total bill for the dinner was $414.70. Each student paid his/her equal
share of the bill, which was $18.85. How many student’s were at the
dinner?
|
a. |
4 |
|
b. |
415 |
|
c. |
19 |
|
d. |
22 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
75.
The standard deviation of a sample was reported to be 20.
The report indicated that = 7200. What has been the sample size?
|
a. |
16 |
|
b. |
17 |
|
c. |
18 |
|
d. |
19 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
76.
The variance of a sample was reported to be 144. The
report indicated that = 7200. What has been the sample size?
|
a. |
49 |
|
b. |
50 |
|
c. |
51 |
|
d. |
52 |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
77.
From a population of size 1,000, a random sample of 100 items is
selected. The mean of the sample
|
a. |
must be 10 times smaller than the mean
of the population |
|
b. |
must be equal to the mean of the
population, if the sample is truly
random |
|
c. |
must be 10 times larger than the mean
of the population |
|
d. |
can be larger, smaller or equal to the
mean of the population |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
78.
From a population of size 500, a random sample of 50 items is selected.
The mode of the sample
|
a. |
must be 500 |
|
b. |
must be equal to the mode of
population, if the sample is truly
random |
|
c. |
must be equal to the mean of the
population, if the sample is truly
random |
|
d. |
can be larger, smaller or equal to the
mode of the population |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
79.
From a population of size 400, a random sample of 40 items is
selected. The median of the sample
|
a. |
must be 200, since 400 divided by 2 is
200 |
|
b. |
must be 10, since 400 divided by 400 is
10 |
|
c. |
must be equal to the median of
population, if the sample is truly
random |
|
d. |
None of these alternatives is correct. |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
80.
A box plot is a graphical technique which is used for
|
a. |
only one group of data |
|
b. |
making comparisons between only two
groups |
|
c. |
making comparisons between two or more
groups |
|
d. |
summing the deviations from the mean
and placing the sum in a box |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
Exhibit 3-1
The following data show the number of hours worked by 200
statistics students.
|
Number of Hours |
Frequency |
|
0 – 9 |
40 |
|
10 – 19 |
50 |
|
20 – 29 |
70 |
|
30 – 39 |
40 |
81.
Refer to Exhibit 3-1. The class width for this distribution
|
a. |
is 9 |
|
b. |
is 10 |
|
c. |
is 11 |
|
d. |
varies from class to class |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
82.
Refer to Exhibit 3-1. The number of students working 19 hours or
less
|
a. |
is 40 |
|
b. |
is 50 |
|
c. |
is 90 |
|
d. |
cannot be determined without the
original data |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
83.
Refer to Exhibit 3-1. The relative frequency of students working
9 hours or less
|
a. |
is .2 |
|
b. |
is .45 |
|
c. |
is 40 |
|
d. |
cannot be determined from the
information given |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
84.
Refer to Exhibit 3-1. The cumulative relative frequency for the
class of 10 – 19
|
a. |
is 90 |
|
b. |
is .25 |
|
c. |
is .45 |
|
d. |
cannot be determined from the
information given |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
Exhibit 3-2
A researcher has collected the following sample data
|
5 |
12 |
6 |
8 |
5 |
|
6 |
7 |
5 |
12 |
4 |
85.
Refer to Exhibit 3-2. The median is
|
a. |
5 |
|
b. |
6 |
|
c. |
7 |
|
d. |
8 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
86.
Refer to Exhibit 3-2. The mode is
|
a. |
5 |
|
b. |
6 |
|
c. |
7 |
|
d. |
8 |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
87.
Refer to Exhibit 3-2. The mean is
|
a. |
5 |
|
b. |
6 |
|
c. |
7 |
|
d. |
8 |
ANS:
C
PTS: 1
TOP: Descriptive Statistics
88.
Refer to Exhibit 3-2. The 75th percentile is
|
a. |
5 |
|
b. |
6 |
|
c. |
7 |
|
d. |
8 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
Exhibit 3-3
A researcher has collected the following sample data. The mean
of the sample is 5.
|
3 |
5 |
12 |
3 |
2 |
89.
Refer to Exhibit 3-3. The variance is
|
a. |
80 |
|
b. |
4.062 |
|
c. |
13.2 |
|
d. |
16.5 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
90.
Refer to Exhibit 3-3. The standard deviation is
|
a. |
8.944 |
|
b. |
4.062 |
|
c. |
13.2 |
|
d. |
16.5 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
91.
Refer to Exhibit 3-3. The coefficient of variation is
|
a. |
72.66% |
|
b. |
81.24% |
|
c. |
264% |
|
d. |
330% |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
92.
Refer to Exhibit 3-3. The range is
|
a. |
1 |
|
b. |
2 |
|
c. |
10 |
|
d. |
12 |
ANS:
C
PTS:
1
TOP: Descriptive Statistics
93.
Refer to Exhibit 3-3. The interquartile range is
|
a. |
1 |
|
b. |
2 |
|
c. |
10 |
|
d. |
12 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
Exhibit 3-4
The following is the frequency distribution for the speeds of a
sample of automobiles traveling on an interstate highway.
|
Speed Miles per Hour |
Frequency |
|
50 – 54 |
2 |
|
55 – 59 |
4 |
|
60 – 64 |
5 |
|
65 – 69 |
10 |
|
70 – 74 |
9 |
|
75 – 79 |
5 |
|
|
35 |
94.
Refer to Exhibit 3-4. The mean is
|
a. |
35 |
|
b. |
670 |
|
c. |
10 |
|
d. |
67 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
95.
Refer to Exhibit 3-4. The variance is
|
a. |
6.969 |
|
b. |
7.071 |
|
c. |
48.570 |
|
d. |
50.000 |
ANS:
D
PTS: 1
TOP: Descriptive Statistics
96.
Refer to Exhibit 3-4. The standard deviation is
|
a. |
6.969 |
|
b. |
7.071 |
|
c. |
48.570 |
|
d. |
50.000 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
Exhibit 3-5
You are given the following frequency distribution.
|
Class |
Frequency |
|
10-14 |
1 |
|
15-19 |
2 |
|
20-24 |
5 |
|
25-29 |
8 |
|
30-34 |
4 |
97.
Refer to Exhibit 3-5. The mean is
|
a. |
500 |
|
b. |
26.315 |
|
c. |
30 |
|
d. |
25 |
ANS:
D
PTS: 1
TOP: Descriptive Statistics
98.
Refer to Exhibit 3-5. The variance is
|
a. |
570 |
|
b. |
5.477 |
|
c. |
500 |
|
d. |
30 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
99.
Refer to Exhibit 3-5. The standard deviation is
|
a. |
570 |
|
b. |
5.477 |
|
c. |
25 |
|
d. |
30 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
100.
Refer to Exhibit 3-5. The coefficient of variation is
|
a. |
25% |
|
b. |
21.91% |
|
c. |
5.477% |
|
d. |
30% |
ANS: B
PTS:
1
TOP: Descriptive Statistics
Exhibit 3-6
The closing stock price of MNM Corporation for the last 7
trading days is shown below.
|
Day |
Stock Price |
|
1 |
84 |
|
2 |
87 |
|
3 |
84 |
|
4 |
88 |
|
5 |
85 |
|
6 |
90 |
|
7 |
91 |
101.
Refer to Exhibit 3-6. The mean is
|
a. |
84 |
|
b. |
85 |
|
c. |
86 |
|
d. |
87 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
102.
Refer to Exhibit 3-6. The mode is
|
a. |
84 |
|
b. |
85 |
|
c. |
86 |
|
d. |
87 |
ANS:
A
PTS: 1
TOP: Descriptive Statistics
103.
Refer to Exhibit 3-6. The median is
|
a. |
84 |
|
b. |
85 |
|
c. |
86 |
|
d. |
87 |
ANS:
D
PTS:
1
TOP: Descriptive Statistics
104.
Refer to Exhibit 3-6. The range is
|
a. |
7 |
|
b. |
8 |
|
c. |
9 |
|
d. |
91 |
ANS:
A
PTS:
1
TOP: Descriptive Statistics
105.
Refer to Exhibit 3-6. The variance is
|
a. |
2.828 |
|
b. |
8 |
|
c. |
9 |
|
d. |
81 |
ANS:
B
PTS:
1
TOP: Descriptive Statistics
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