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## Test Bank Solution Manual Introductory Statistics 9 Ed by Neil A.Weiss

### Sample Chapter

### Introductory Statistics (IS) / Elementary Statistics (ES): Chapter 1 Form A Exam

Name ___

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

Provide an appropriate response.

1) The table below shows the number of new AIDS cases in the U.S. in each

of the years 1989-1994.

Year New AIDS cases

1989 33,643

1990 41,761

1991 43,771

1992 45,961

1993 103,463

1994 61,301

Classify the study as either descriptive or inferential.

1)

Answer the question.

2) A magazine publisher always mails out a questionnaire six months before

a subscription ends. This questionnaire asks its subscribers if they are

going to renew their subscriptions. On average, only 7% of the

subscribers respond to the questionnaire. Of the 7% who do respond, an

average of 47% say that they will renew their subscription. This 7% who

respond to the questionnaire are known as what?

2)

Identify the study as an observational study or a designed experiment.

3) An educational researcher used school records to determine that, in one

school district, 84% of children living in two-parent homes graduated

high school while 75% of children living in single-parent homes

graduated high school.

3)

Provide an appropriate response.

4) Why do statisticians sometimes use inferential statistics to draw

conclusions about a population? In what situations might a statistician

draw conclusions about a population using descriptive statistics only?

4)

Identify the study as an observational study or a designed experiment.

5) A clinic gives a drug to a group of ten patients and a placebo to another

group of ten patients to find out if the drug has an effect on the patients’

illness.

5)

List all possible samples from the specified population.

6) The six members of a board of directors are Sam (S), Laurie (L), Peggy (P),

Jorges (J), Max (M), and Claude (C). Consider these board members to be

a population of interest. List the 15 possible samples (without

replacement) of size four from this population of six board members.

Provide an appropriate response.

7) The finalists in an essay competition are Lisa (L), Melina (M), Ben (B),

Danny (D), Eric (E), and Joan (J). Consider these finalists to be a

population of interest. The possible samples (without replacement) of size

three that can be obtained from this population of six finalists are as

follows.

L,M,B L,M,D L,M,E L,M,J L,B,D L,B,E

L,B,J L,D,E L,D,J L,E,J M,B,D M,B,E

M,B,J M,D,E M,D,J M,E,J B,D,E B,D,J

If a simple random sampling method is used to obtain a sample of three

of the finalists, what are the chances of selecting Ben, Danny, and Joan?

7)

Use the random number table in Appendix A to obtain the required list of random numbers.

8) A company employs 5382 people and wishes to interview a random

sample of 14 of them with regard to the company’s health insurance

policy. Construct a list of 14 random numbers between 1 and 5382 that

can be used in obtaining the required simple random sample. Use the

random number table and use as your starting point the digits 0691 in

row 3, columns 30-33.

8)

Provide an appropriate response.

9) A political researcher wishes to gauge political sentiment regarding a

proposed tax cut. He obtains a list of 1000 email addresses from an

internet provider, uses a random number table to select a random sample

of 100 of these addresses, emails the people in the sample and requests

that they respond to his questions by email. Do you think that the group

of people who respond is likely to be representative of all registered

voters? Explain your answer.

9)

10) True or false? In simple random sampling, each possible sample is

equally likely to be the one obtained.

10)

11) From a group of 496 students, every 49th student starting with the 3rd

student is selected. Identify the type of sampling used in this example.

11)

12) Describe the steps involved when using stratified random sampling with

proportional allocation. What are the advantages of this sampling

method?

Test Bank Solution Manual Introductory Statistics 9 Ed by Neil A.Weiss

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