1. In practice, most studies involve relatively large
populations for which taking a sample can provide satisfactory
results much more quickly and at considerably lower cost than a
census.
2.Which of the following is not an example of primary data?
|
a. Data published by the New York Stock Exchange. |
|
|
|
b. Financial data tapes that contain data compiled from the New
York Stock Exchange. |
|
|
|
c. Data published by Statistics Canada. |
|
|
|
d. Data published by the United States Bureau of Census. |
|
3. The table below gives the probabilities of combinations of
religion and political parties in a major U.S. city.
Which of the following represents two mutually exclusive
events?
|
|
|
|
|
e. All of these are mutually exclusive |
|
4. Which probability distribution is appropriate when sampling
is performed without replacement from a relatively small
population?
|
|
b. Hypergeometric distribution |
|
|
|
|
d. Exponential distribution |
|
|
|
5.
A local police station receives an average 8.1 emergency
telephone calls per hour. These calls are Poisson distributed.
|
|
The probability that the station will get nine calls in an hour
is:
6.At the annual freshman mixer at your university, each student
places a card with his/her name in a large basket. A card is drawn
for the evening's door prize. This is an example of:
|
a. a nonprobability sample. |
|
|
|
|
c. a simple random sample. |
|
|
|
d. both "a nonprobability sample" AND "a simple random sample"
are correct. |
|
|
|
e. both "a probability sample" AND "a simple random sample" are
correct. |
|
7.Which of the following statements are true?
|
a. For the Poisson distribution = 3.2, the mean
and standard deviation are both equal to 3.2. |
|
|
|
b. For the Poisson distribution = 3.2, the
mean and variance are both equal to 3.2. |
|
|
|
c. For the Poisson distribution = 3.2, the
mean is 3.2 and the standard deviation is 1.79. |
|
|
|
d. Both "For the Poisson distribution = 3.2, the
mean" AND "variance are both equal to 3.2 and For the Poisson
distribution = 3.2, the
mean is 3.2 and the standard deviation is 1.79" are correct. |
|
|
|
e. All of these are correct. |
|
8. Which of the following is a correct statement?
|
a. A parameter is a characteristic of the sample. |
|
|
|
b. A census is always a better measurement than is a
sample. |
|
|
|
c. A parameter is a characteristic of the universe. |
|
|
|
d. A statistic describes a variable for the population. |
|
|
|
e. A census is a measurement of a sample. |
|
9. A student is randomly selected from a class. Event A = the
student is a male and Event B = the student is a female. Events A
and B are:
|
|
|
|
|
e. both "mutually exclusive" AND "exhaustive". |
|
10.To overcome one of the shortcomings of telephone surveys due
to unlisted telephone numbers:
|
a. survey takers employ random digit dialing facilities. |
|
|
|
b. survey takers go door to door and identify the unlisted
telephone subscribers. |
|
|
|
c. survey takers purchase lists of unlisted telephone numbers
from magazine subscribers. |
|
|
|
d. survey takers contact telephone companies for a list of
unlisted telephone numbers. |
|
|
|
e. survey takers purchase mail lists of unlisted telephone
number subscribers. |
|
11. Theoretically, the number of times an event can occur over
the given time span in a Poisson distribution has no limit.
12.The driving time between Big Rapids and Grand Rapids is an
example of a discrete random variable.
13. When the sample mean differs from the population mean simply
be chance, the error that results is known as:
14. A company manufactures women's hosiery. The company sells
slightly irregular panty hose through a mail-order catalog service.
If the company produces 300,000 pairs of hose per day and the
probability of a pair not being irregular is 0.92, the average
number that will be available for the catalog order department
is: