1. A group of veterinarians at a major veterinary hospital was interested in inv
ID: 3303339 • Letter: 1
Question
1. A group of veterinarians at a major veterinary hospital was interested in investigating a possible link between enteroliths, stones that form in the colon of horses, and diet. They decided to conduct a survey of feeding practices of horses admitted to the veterinary hospital. To obtain a simple random sample they used a computer to generate four-digit ID numbers for all horses. They used random digit tables to select the horses. Which is a step in selecting a random sample by this procedure?
1. Pick a random starting point in the table and read four digits.
2. Read four digits across a line and, if the four digits correspond to a horse ID, select the animal.
3. Discard any sequence that does not correspond to a horse ID and move to the next four digits.
4. All of the answer choices are correct.
2. A small math department has six faculty members and 30 students. It can send six people to a national convention and they would like to send four students and two faculty members. Of the 30 students, four are selected randomly, and then two faculty members are randomly selected from the six. This is an example of:
1. simple random sampling.
2. stratified random sampling.
3. voluntary response sampling.
4. a census.
3. The Excite Poll is an online poll at poll.excite.com. You click on an answer to become part of the sample. One poll question was “Do you prefer watching first-run movies at a movie theater, or waiting until they are available on home video or pay-per-view?” A total of 8896 people responded with 1118 saying they preferred theaters. From this survey, you should conclude that:
1. Americans prefer watching movies at home.
2. a larger sample is necessary.
3. the poll uses voluntary response, so the results tell us little about the population of all adults.
4. movie theaters should lower their prices.
4. Import customs officials sometimes randomly select crates of cargo for close, but time-consuming, inspection. Suppose there are nine crates of cargo from the following companies, each containing several hundred items. Customs officials will randomly select four for close inspection.
1. Ravenburg
4. Dallhoise
7. Cherryport
2. Corsair
5. Baggate
8. Foxwood
3. Sapphire
6. Strommond
9. Bamboro
To do this, use the numerical labels attached to the previous names and the following list of random digits. Read the list of random digits from left to right, starting at the beginning of the list.
748803 12009 45287 71753 98236 66419 84533 11793 20495 05907 11384
The simple random sample is:
1. 7488.
2. 7483.
3. Cherryport, Dallhoise, Foxwood, and Sapphire.
4. Cherryport, Foxwood, Bamboro, and Strommond.
5. Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted. The population of interest is:
1. the residents in the suburb that support a new recreation center.
2. the 250,000 households contacted.
3. only U.S. households with phones.
4. all U.S. households.
6. A placebo is an important element of many clinical trials because:
1. it serves as a control for the experiment.
2. it allows the researcher to adjust for psychological effects of receiving medical attention.
3. use of the placebo can help avoid confounding.
4. All of the answer choices are correct.
1. A group of veterinarians at a major veterinary hospital was interested in investigating a possible link between enteroliths, stones that form in the colon of horses, and diet. They decided to conduct a survey of feeding practices of horses admitted to the veterinary hospital. To obtain a simple random sample they used a computer to generate four-digit ID numbers for all horses. They used random digit tables to select the horses. Which is a step in selecting a random sample by this procedure?
1. Pick a random starting point in the table and read four digits.
2. Read four digits across a line and, if the four digits correspond to a horse ID, select the animal.
3. Discard any sequence that does not correspond to a horse ID and move to the next four digits.
4. All of the answer choices are correct.
2. A small math department has six faculty members and 30 students. It can send six people to a national convention and they would like to send four students and two faculty members. Of the 30 students, four are selected randomly, and then two faculty members are randomly selected from the six. This is an example of:
1. simple random sampling.
2. stratified random sampling.
3. voluntary response sampling.
4. a census.
3. The Excite Poll is an online poll at poll.excite.com. You click on an answer to become part of the sample. One poll question was “Do you prefer watching first-run movies at a movie theater, or waiting until they are available on home video or pay-per-view?” A total of 8896 people responded with 1118 saying they preferred theaters. From this survey, you should conclude that:
1. Americans prefer watching movies at home.
2. a larger sample is necessary.
3. the poll uses voluntary response, so the results tell us little about the population of all adults.
4. movie theaters should lower their prices.
4. Import customs officials sometimes randomly select crates of cargo for close, but time-consuming, inspection. Suppose there are nine crates of cargo from the following companies, each containing several hundred items. Customs officials will randomly select four for close inspection.
1. Ravenburg
4. Dallhoise
7. Cherryport
2. Corsair
5. Baggate
8. Foxwood
3. Sapphire
6. Strommond
9. Bamboro
To do this, use the numerical labels attached to the previous names and the following list of random digits. Read the list of random digits from left to right, starting at the beginning of the list.
748803 12009 45287 71753 98236 66419 84533 11793 20495 05907 11384
The simple random sample is:
1. 7488.
2. 7483.
3. Cherryport, Dallhoise, Foxwood, and Sapphire.
4. Cherryport, Foxwood, Bamboro, and Strommond.
5. Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted. The population of interest is:
1. the residents in the suburb that support a new recreation center.
2. the 250,000 households contacted.
3. only U.S. households with phones.
4. all U.S. households.
6. A placebo is an important element of many clinical trials because:
1. it serves as a control for the experiment.
2. it allows the researcher to adjust for psychological effects of receiving medical attention.
3. use of the placebo can help avoid confounding.
4. All of the answer choices are correct.
Explanation / Answer
Answer:
1. (4) All of the answer choices are correct.
2. (2) Stratified random sampling
3. (3) the poll uses voluntary response, so the results tell us little about the population of all adults.
4. All the answers seem to be correct.
5. (2) the 250,000 households contacted.
6. (4) All of the answer choices are correct.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.