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Ch07 - Ch 7 prep questions

Analytical Methods for Business (University of Arizona)

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ch07

Student:

1. A population consists of all items of curiosity-behalf in a statistical acme. Penny False

2. We apportion a parameter to compel conclusions environing a statistic. Penny False

3. Unfairness refers to the inclination of a specimen statistic to often aggravate- or disparage a population parameter.

True False

4. Selection unfairness befalls when the specimen is mistakenly disjoined into strata, and stray specimens are drawn from each stratum.

True False

5. Nonresponse unfairness befalls when those responding to a superintend or poll be-unlike often from the non-respondents.

True  False

6. A ultimate stray specimen is a specimen of n observations which has the corresponding presumption of nature clarified from the population as any other specimen of n observations.

True False

7. In stratified stray sampling, the population is primeval disjoined up into mutually unpopular and accumulatively debilitating groups, denominated strata. A stratified specimen involves strayly clarified observations from each stratum, which are interrelationshipal to the stratum's bulk.

True False

8. A specimen consists of all items of curiosity-behalf in a statistical acme, when-in-fact a population is a subset of the population. We apportion a parameter to compel conclusions environing the obscure specimen statistic.

True False

9. If we had admittance to postulates that complete the integral population, then the prizes of the parameters would be notorious and no statistical conclusion would be needed.

True False

10. A parameter is a stray mutable, when-in-fact a specimen statistic is a fixed. Penny False

11. When a statistic is used to admire a parameter, the statistic is referred to as an estimator. A feature prize of the estimator is denominated an admire.

True False

12. The flag irregularity of equals the population flag irregularity disjoined by the balance radicle of the

specimen bulk, or equivalently, .

True False

13. For any specimen bulk n, the sampling dispensation of is recognized if the population from which the specimen is drawn is uninterruptedly reserved.

True False

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14. For any population after a while expected prize µ and flag irregularity σ, the sampling dispensation of gain be almost recognized if the specimen bulk n is sufficiently diminutive. As a public guideline, the

recognized dispensation adit is justified when .

True False

15. For any population interrelation p, the sampling dispensation of gain be almost recognized if the

specimen bulk n is sufficiently big. As a public guideline, the recognized dispensation adit is

justified when and . Penny False

16. Which of the forthcoming is an in of a specimen statistic?

A.

B. µ

C. σ

D. σ2

17. Which of the forthcoming is not a population parameter?

A.

B. µ

C. σ

D. σ2

18. A census is an in of .

A. Specimen postulates

B. Specimen statistic

C. Population postulates

D. Population parameter

19. Unfairness can befall in sampling. Unfairness refers to .

A. The opposition of the population into aggravatelapping groups

B. The fabrication of strata, which are interrelationshipal to the stratum's bulk

C. The use of bunch sampling instead of stratified stray sampling

D. The inclination of a specimen statistic to often aggravate- or disparage a population parameter

20. Selection unfairness befalls when .

A. The population has been disjoined into strata

B. Portions of the population are outside from the motive for the specimen

C. Bunch sampling is used instead of stratified stray sampling

D. Those responding to a superintend or poll be-unlike often from the non-respondents

21. Nonresponse unfairness befalls when .

A. The population has been disjoined into strata

B. Portions of the population are outside from the specimen

C. Bunch sampling is used instead of stratified stray sampling

D. Those responding to a superintend or poll be-unlike often from the non-respondents

22. Which of the forthcoming is not a mould of unfairness?

A. Portions of the population are outside from the specimen.

B. Knowledge from the specimen is natural of knowledge in the population.

C. Knowledge from the specimen aggravateemphasizes a feature stratum of the population.

D. Those responding to a superintend or poll be-unlike often from the non-respondents.

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23. Which of the forthcoming meets the requirements of a ultimate stray specimen?

AA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve six mass who offer for the specimen.

BA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve six mass selected at stray, after a whileout conceive to age.

CA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve six males selected at stray, after a whileout conceive to age.

DA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve two mass selected at stray below the age of 25 and impure mass selected at stray aggravate 25.

24. Which of the forthcoming meets the requirements of a stratified stray specimen?

AA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve six mass who offer for the specimen.

BA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve six mass selected at stray, after a whileout conceive to age.

CA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve six males selected at stray, after a whileout conceive to age.

DA population contains 10 members below the age of 25 and 20 members aggravate the age of 25. The specimen

. gain involve two mass selected at stray below the age of 25 and impure mass selected at stray aggravate 25.

25. Which of the forthcoming is penny environing statistics such as the specimen moderation or specimen interrelationship?

A. A statistic is a fixed.

B. A statistic is a parameter.

C. A statistic is frequently notorious.

D. A statistic is a stray mutable.

26. Statistics are used to admire population parameters, featurely when it is unusable or too expensive

to poll an integral population. A feature prize of a statistic is referred to as a(n) .

A. Mean

B. Stratum

C. Estimate

D. Finite amendment factor

27. Which of the forthcoming is considered an estimator?

A.

B. µ

C. σ

D. σ2

28. Which of the forthcoming is considered an admire?

A.

B.

C.

D.

29. What is the relation among the expected prize of the specimen moderation and the expected prize of the population?

A.

B.

C.

D.

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30. How does the antagonism of the specimen moderation assimilate to the antagonism of the population?

A. It is diminutiveer and for-this-reason suggests that mediocres bear short discrepancy than single observations.

B. It is bigr and for-this-reason suggests that mediocres bear short discrepancy than single observations.

C. It is diminutiveer and for-this-reason suggests that mediocres bear past discrepancy than single observations.

D. It is bigr and for-this-reason suggests that mediocres bear past discrepancy than single observations.

31. What is the relation among the flag irregularity of the specimen moderation and the population flag irregularity?

A.

B.

C.

D.

32. A teach sells trees of be-unlikeent types and acmes. These trees mediocre 60 inches in acme after a while a flag irregularity of 16 inches. Suppose that 75 decline trees are sold for exercise at City Hall. What is the flag irregularity for the specimen moderation?

A. 1.85

B. 3.41

C. 4

D. 16

33. If a population is notorious to be recognizedly reserved, what can be said of the sampling dispensation of the specimen moderation drawn from this population?

A. For any specimen bulk n, the sampling dispensation of the specimen moderation is recognizedly reserved.

B. For a specimen bulk , the sampling dispensation of the specimen moderation is recognizedly reserved.

C. For a specimen bulk , the sampling dispensation of the specimen moderation is recognizedly reserved.

D. For a specimen bulk , the sampling dispensation of the specimen moderation is recognizedly reserved.

34. Aggravate the integral six years that students heed an Ohio physical teach, they are listless, on mediocre,

28 days due to influenza. Assume that the flag irregularity aggravate this season limit is days. Upon graduation from physical teach, a stray specimen of 36 students is taken and asked how divers days of teach they missed due to influenza.

Refer to Exhibit 7-1. What is the expected prize for the sampling dispensation of the calculate of teach days missed due to influenza?

A. 6

B. 9

C. 28

D. 168

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