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Homework answers / question archive / Georgia southwestern university Chapter 8 Use the following to answer questions 1-2: 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
Georgia southwestern university
Chapter 8
Use the following to answer questions 1-2:
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.
1)The sample is
A) the 250,000 households initially contacted.
B) the 240,000 households that respond.
C) the 10,000 households that did not respond.
D) all U.S. households.
2. The population of interest is
A) the residents in the suburb that support the new recreation center.
B) the 250,000 households contacted.
C) only U.S. households with phones.
D) all U.S. households.
3. A campus organization has 80 student members and 10 faculty members. They can send 5 people to a national convention and they would like to send 3 students and 2 faculty members. Of the 80 students, 3 are selected at random and of the 10 faculty members, 2 are selected at random. This is an example of
A) simple random sampling.
B) stratified random sampling.
C) nonvoluntary response sampling.
D) a census.
4. The television program Nightline once asked viewers whether the United Nations should continue to have its headquarters in the United States. Two phone numbers were given. Viewers were asked to call one telephone number to respond “Yes” and the other to respond “No”. More than 186,000 callers responded and 67% said “No.” This is an example of
A) voluntary response sampling.
B) a survey with little bias because a large SRS was used.
C) a survey with little bias since someone who called would know his or her opinion.
D) all of the above.
5. At a large university a simple random sample of 5 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) a simple random sample.
B) biased due to imbalance.
C) a stratified sample.
D) all of the above.
Use the following to answer questions 6-8:
Advice columnist Ann Landers once asked her female readers whether they would be content with affectionate treatment by men, with no sex ever. Over 90,000 women wrote in, with 72% answering “Yes.” Many of the letters described unfeeling treatment at the hands of men.
6. The sample is
A) the over 90,000 women who wrote in.
B) the 72% of women who answered “Yes.”
C) the women who experienced unfeeling treatment at the hands of men.
D) all her female readers.
7. The sample
A) is probably biased with 72% probably higher than the percent of all adult women
who would answer “Yes.”
B) is probably biased with 72% probably higher than the percent of all adult women
who would answer “Yes.”
C) has little bias since the women were able to describe their unfeeling treatment at the
hands of men.
D) has little bias since 90,000 is a very large sample.
8. The population of interest is
A) the over 90,000 women who wrote in.
B) the 72% of women who answered yes.
C) the women who experienced unfeeling treatment at the hands of men.
D) all her female readers.
9. A simple random sample of 1200 adult Americans is selected, and each person is asked
the following question.
“In light of the huge national deficit, should the government at this time spend
additional money to establish a national system of health insurance?”
Only 39% of those responding answered “Yes.” This survey
A) is reasonably accurate since it used a large, simple random sample.
B) probably overstates the percentage of people that favor a system of national health
insurance.
C) probably understates the percentage of people that favor a system of national health
insurance.
D) is very inaccurate, but neither understates nor overstates the percentage of people
that favor a system of national health insurance. Since simple random sampling was
used, it is unbiased.
10. 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
A) simple random sampling.
B) stratified random sampling.
C) multistage sampling.
D) convenience sampling.
