Question

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.

a. True b. False

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?

a. (A and D).

b. (A and E).

c. (A and G).

d. (A and F).

e. All of these are mutually exclusive

4. Which probability distribution is appropriate when sampling is performed without replacement from a relatively small population?

a. Binomial distribution

b. Hypergeometric distribution

c. Poisson distribution

d. Exponential distribution

e. Normal 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:

a. 0.1256.

b. 0.0408.

c. 0.3082.

d. 0.6918.

e. 0.8744.

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.

b. a probability 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:

a. mutually exclusive.

b. exhaustive.

c. intersecting.

d. dependent.

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.

a. True b. False

12.The driving time between Big Rapids and Grand Rapids is an example of a discrete random variable.

a. True b. False

13. When the sample mean differs from the population mean simply be chance, the error that results is known as:

a. response error.

b. sampling error.

c. bias.

d. nonresponse error.

e. nonsystematic error.

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:

a. 148.59

b. 24000

c. 22080

d. 15.49

e. 154.92

Answer 1

1. TRUE

2.  Financial data tapes that contain data compiled from the New York Stock Exchange is not an example of primary data.

Correct ans - B

3. Events A and D are mutually exclusive since a person who is already belonging to Protestant religious group cannot belong to the 'Other' group. However s/he can be Democrat, Republican or Independent.

Correct Ans - A

4.  

A hypergeometric experiment is a statistical experiment that has the following properties:

• A sample of size n is randomly selected without replacement from a population of N items.
• In the population, k items can be classified as successes, and N - k items can be classified as failures

The hypergeometric distribution is used to calculate probabilities when sampling without replacement.

Correct Ans - B