Ba3010 ch 13 hw

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Ch 13 HW 1-20 All 22-26 even

1. Sample—C--A subset of a larger collection of items

2. Census—G--A comprehensive study of every item in a population

3. Target population—A A complete collection of items desired to be studied

4. Statistic—E—A characteristic of a sample

5. Parameter—I—A characteristic of a population

6. Sampling frame—B—A list of all the items in the population

7. Simple random sample—J—Sample chosen so that all subsets of size n are equally likely

8. Stratum—D—A homogeneous subset of the population

9. Bias—F—Occurs if a sampling method distorts a property of the population

10. Nonresponse—H—The result if a respondent chooses not to answer questions

11. True

12. False- The sample size for a survey should be fixed not given a percentage

13. False- Bias due to the wrong wording can cause misleading results

14. True

15. False- The sampling frame is a list of items we draw the sample from not the entire list

16. True

17. False- In a voluntary response sampling, people decide whether to join the sample in

response to an open invitation

18. False- If we take different samples of the same size from the same population over and

over, each sample would be different

19. False- Bias due to the wording causes misleading results

20. True

22 a. All Hotels.com users

b. Average rating

c. All internet users

d. 99

e. Voluntary response through survey

f. Nonrandom voluntary response only Hotels.com users can respond, that leads under

coverage bias

24a. Milk is the population

b. Whether milk contains dirt, antibiotics unsuited for human consumption or other

foreign matter

c. Sampling is all dairy farms

d. The sample size is not given.

e. The sampling design is not given

f. Since the sampling design is not given, if this is a nonrandom sampling then it can cause

bias.

26a. All TV holders

b. Name of cable provider or other source of programming

c. All TV purchasers

d. The sample size is not given

e. Voluntary response through survey

f. nonrandom voluntary response sample, that leads nonresponse bias, also the sample is

selected from TV purchasers, that leads under coverage

28a. Nonrandom, only viewers watching the tv program can be apart of the sample, that leads

under coverage, and suggests that the conclusion might not be valid.

b. Sample was selected through meeting, attracts people who feel strongly about the issue in

question, that leads bias.

c. Cluster sampling, bank is divided into branches and then at randomly selected day all

customers were contacted. Random sampling.

d. Systematic sample, this is a good sampling design

30 The wording is in favor on the former payroll system. This question could be improved as

which system do you think is better?

32. If a survey of 65 current customers at a dealership indicates 55% rate its service as

exceptionally good then actually less than 55% of all customers at this dealership would rate its

service as exceptionally good. The dealership tries to keep unsatisfied customers out of the

survey.

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Ch 13 HW 1-20 All 22-26 even 1. Sample—C--A subset of a larger collection of items 2. Census—G--A comprehensive study of every item in a population 3. Target population—A A complete collection of items desired to be studied 4. Statistic—E—A characteristic of a sample 5. Parameter—I—A characteristic of a population 6. Sampling frame—B—A list of all the items in the population 7. Simple random sample—J—Sample chosen so that all subsets of size n are equally likely 8. Stratum—D—A homogeneous subset of the population 9. Bias—F—Occurs if a sampling method distorts a property of the population 10. Nonresponse—H—The result if a respondent chooses not to answer questions 11. True 12. False- The sample size for a survey should be fixed not given a percentage 13. False- Bias due to the wrong wording can cause misleading results 14. True 15. False- The sampling fra ...
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