7. simple random sample because all horses have the same chance of being picked.
ID: 3174087 • Letter: 7
Question
7.
simple random sample because all horses have the same chance of being picked.
9.
simple random sampling.
10.
movie theaters should lower their prices.
11.
All of the answer choices are correct.
12.
(S-AQ 8.54) At a party there are 36 students over age 21 and 24 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol..
You have given every student at the party the same chance to be interviewed:
what is that chance? %
(Round your answer to the nearest whole percent.)
(8.19) In the survey for the previous exercise, there are 9911 registered voters in his district. You label the voters 0001 to 9911 in alphabetical order. Using line 121 of Table B to select the sample, the first 5 voters in your sample would be (enter them as a comma delimited list #,#,#,#,#).
Systematic random samples.Systematic random samples go through a list of the population at fixed intervals from a randomly chosen starting point. For example, a study of dating among college students chose a systematic sample of 200 single male students at a university as follows. Start with a list of all 9000 single male students. Because 9000/200 = 45, choose one of the first 45 names on the list at random and then every 45th name after that. For example, if the first name chosen is at position 23, the systematic sample consists of the names at positions 23, 68, 113, 158, and so on up to 8978.
Foresters were interested in studying a remote sensing measure of standing timber as an alternative to taking measurements on the ground. The study area was a 1200 acre pine forest in Louisiana on which the U.S. Forest Service first created a grid of 1410 equally spaced circular plots of 0.05 acre in size over a map of the forest. The ground survey then visited every 10th plot and took measurements of tree volume.
Consider the plots numbered 1 through 10 as being numbered 0 through 9 using the Table B.
Now choose a systematic random sample of 141 plots for the ground survey. Use Table B, start at line 112
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 random sample of the 5000 horses that had been admitted over the last 10 years to the hospital, they sequentially assigned numbers starting with 1 to the horses in order of admittance. They then picked a random starting point and decided to sample every 100th horse to get a random sample of 50 horses. This procedure corresponds to a: None of the answer choices is correct. stratified random sample because the procedure is obviously not a simple random sample. systematic sample because not all sample are possible.simple random sample because all horses have the same chance of being picked.
9.
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: stratified random sampling. a census. voluntary response sampling.simple random sampling.
10.
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: the poll uses voluntary response, so the results tell us little about the population of all adults. a larger sample is necessary. Americans prefer watching movies at home.movie theaters should lower their prices.
11.
At a large university a simple random sample of five female professors is selected and a simple random sample of 10 male professors is selected. The two samples are combined to give an overall sample of 15 professors. The overall sample is: a simple random sample. biased due to imbalance. a stratified sample.All of the answer choices are correct.
12.
During the 1936 presidential election between Franklin D. Roosevelt and Alf Landon, the Literary Digest received 2.3 million mail-in ballots that it used to predict the results: a landslide in favor of Landon. Clearly, there has never been a President Landon, so the prediction was incorrect. Why? All of the answer choices are correct. The survey relied on voluntary responses, which would introduce a bias. The survey was subject to nonresponse bias. A sample taken only from Literary Digest readers would not necessarily represent the views of the American public in general. 13. Advice columnist Ann Landers once asked her readers with children to answer the following question: “If you had it to do over again, would you have children?” Readers were invited to send a response to this question by mail. Of the approximately 10,000 responses Landers received, approximately 70% said “no.” The sample is: all readers. the approximately 10,000 readers who wrote in. the approximately 70% of women who answered “no.” the respondents that regretted having children. 14. Advice columnist Ann Landers once asked her readers with children to answer the following question: “If you had it to do over again, would you have children?” Readers were invited to send a response to this question by mail. Of the approximately 10,000 responses Landers received, approximately 70% said “no.” The sample: has little bias because more than 10,000 people responded, yielding a very large sample. is probably not representative because more than 10,000 people responded. is probably representative of all parents. is probably not representative of all parents because people who feel very strongly about this issue are more likely to respond than people who do not. 15. Advice columnist Ann Landers once asked her readers with children to answer the following question: “If you had it to do over again, would you have children?” Readers were invited to send a response to this question by mail. Of the approximately 10,000 responses Landers received, approximately 70% said “no.” The population of interest is: the more than 10,000 people that responded. the children that are unwanted. all readers that are parents. the readers with children that regret having children. 16. To select a sample of undergraduate students in the United States, I select a simple random sample of four states. From each of these states, I select a simple random sample of two colleges or universities. Finally, from each of these eight colleges or universities, I select a simple random sample of 20 undergraduates. My final sample consists of 160 undergraduates. This is an example of: convenience sampling. multistage sampling. stratified random sampling. simple random sampling. 17. A news release for a diet product company reports: “There's good news for the 65 million Americans currently on a diet.” Its own study showed that people who lose weight can keep it off. The sample was 20 graduates of the company's program who endorsed the program in commercials. The results of the sample are probably: biased, understating the effectiveness of the diet. unbiased because the people in the sample are nationally recognized individuals. biased, overstating the effectiveness of the diet. unbiased, but they could be more accurate. A larger sample size should be used. 18.(S-AQ 8.54) At a party there are 36 students over age 21 and 24 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol..
You have given every student at the party the same chance to be interviewed:
what is that chance? %
(Round your answer to the nearest whole percent.)
19.(8.19) In the survey for the previous exercise, there are 9911 registered voters in his district. You label the voters 0001 to 9911 in alphabetical order. Using line 121 of Table B to select the sample, the first 5 voters in your sample would be (enter them as a comma delimited list #,#,#,#,#).
20.Systematic random samples.Systematic random samples go through a list of the population at fixed intervals from a randomly chosen starting point. For example, a study of dating among college students chose a systematic sample of 200 single male students at a university as follows. Start with a list of all 9000 single male students. Because 9000/200 = 45, choose one of the first 45 names on the list at random and then every 45th name after that. For example, if the first name chosen is at position 23, the systematic sample consists of the names at positions 23, 68, 113, 158, and so on up to 8978.
Foresters were interested in studying a remote sensing measure of standing timber as an alternative to taking measurements on the ground. The study area was a 1200 acre pine forest in Louisiana on which the U.S. Forest Service first created a grid of 1410 equally spaced circular plots of 0.05 acre in size over a map of the forest. The ground survey then visited every 10th plot and took measurements of tree volume.
Consider the plots numbered 1 through 10 as being numbered 0 through 9 using the Table B.
Now choose a systematic random sample of 141 plots for the ground survey. Use Table B, start at line 112
1, 11, 21, 31, 41, ... 2, 12, 22, 32, 42, ... 3, 13, 23, 33, 43, ... 4, 14, 24, 34, 44, ... 5, 15, 25, 35, 45, ... 6, 16, 26, 36, 46, ... 7, 17, 27, 37, 47, ... 8, 18, 28, 38, 48, ... 9, 19, 29, 39, 49, ... 10, 20, 30, 40, 50, ...Explanation / Answer
#7 systematic sample because not all sample are possible.
#9 stratified random sampling because first all members are divided in two groups, faculty and student and then some members are selected from each group.
#10 the poll uses voluntary response, so the results tell us little about the population of all adults.
#11 a stratified sample because first all members are divided in two groups, male and female and then some members are selected from each group.
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