1.
For which measure
of central location will the sum of the deviations of each value from the
data's average will always be zero?

A:
Mode
B:
Mean
C:
Median
D:
Geometric mean

2.
What is the
relationship among the mean, median and mode in a symmetric distribution?

A:
They are all
equal
B:
The mean is
always the smallest value
C:
The mean is
always the largest value
D:
The mode is the
largest value

3.
Which one of the
following is referred to as the population mean?

A:
Statistic
B:
m
C:
Sample
D:
None of the
above

4.
What is the median
of 26, 30, 24, 32, 32, 31, 27 and 29?

A:
32
B:
29
C:30
D:29.5

5.
The U.S.
Department of Education reported that for the past seven years 4,033, 5,652,
6,407, 7,201, 8,719, 11,154, and 15,121 people received bachelor's degrees in
computer and information sciences. What is the arithmetic mean annual number
receiving this degree?

A:
About 12,240
B:
About 8,327
C:
About 6,217
D:
About 15,962

6.
The lengths of
time (in minutes) several underwriters took to review applications for similar
insurance coverage are: 50, 230, 52 and 57. What is the median length of time
required to review an application?

A:
54.5
B:
141.0
C:
97.25
D:109.0

7.
Which measure of
central location is found by arranging the data from smallest to largest and
selecting the middle value?

A:
Arithmetic mean
B:
Median
C:
Mode
D:
Geometric mean

8.
A disadvantage of
using an arithmetic mean to summarize a set of data is

A:
The arithmetic
mean sometimes has two values
B:
It can be used
for interval and ratio data
C:
It is always
different from the median
D:
It can be biased
by one or two extremely small or large values

9.
The mean, as a
measure of central location would be inappropriate for which one of the
following?

A:
Ages of adults
at a senior citizen center
B:
Incomes of
lawyers
C:
Number of pages
in textbooks on statistics
D:
Marital status
of college students at a particular university

10.
What is the
relationship between the variance and the standard deviation?

A:
Variance is the
square root of the standard deviation
B:
Variance is the
square of the standard deviation
C:
Variance is
twice the standard deviation
D:
No constant
relationship between the variance and the standard deviation

11.
A sample of the
monthly amounts spent for food by families of four receiving food stamps
approximates a symmetrical distribution. The sample mean is $150 and the
standard deviation is $20. Using the Empirical Rule, about 95 percent of the
monthly food expenditures are between what two amounts?

A:
$100 and $200
B:
$85 and $105
C:
$205 and $220
D:
$110 and $190

12.
The ages of all
the patients in the isolation ward of the hospital are 38, 26, 13, 41 and 22.
What is the population variance?

A:
106.8
B:
91.4
C:
240.3
D:
42.4

13.
A population
consists of all the weights of all defensive tackles on Sociable University's
football team. They are: Johnson, 204 pounds; Patrick, 215 pounds; Junior,
207 pounds; Kendron, 212 pounds; Nicko, 214 pounds; and Cochran, 208 pounds.
What is the population standard deviation (in pounds)?

A:
About 4
B:
About 16
C:
About 100
D:
About 40

14.
The weights (in
grams) of the contents of several small bottles are 4, 2, 5, 4, 5, 2 and 6.
What is the sample variance?

A:
6.92
B:
4.80
C:
1.96
D:
2.33

15.
The distribution
of a sample of the outside diameters of PVC gas pipes approximates a
symmetrical, bellshaped distribution. The arithmetic mean is 14.0 inches, and
the standard deviation is 0.1 inches. About 68 percent of the outside diameters
lie between what two amounts?

A:
13.5 and 14.5
inches
B:
13.0 and 15.0
inches
C:
13.9 and 14.1
inches
D:
13.8 and 14.2
inches

16.
If the sample
variance for a frequency distribution consisting of hourly wages was computed
to be 10, what is the sample standard deviation?

A:
$1.96
B:
$4.67
C:
$3.16
D:
$10.00

17. Based
on the Empirical Rule, what percent of the observations will lie above the
mean plus two standard deviations?

A:
95%
B:
5%
C:
68%
D:
2.5%

18.
Samples of the wires coming off the production line were tested for tensile
strength. The statistical results (in PSI) were:
According to the
Empirical Rule, the middle 95 percent of the wires tested between
approximately what two values?

A:
450 and 550
B:
460 and 540
C:
420 and 580
D:
380 and 620
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