When the method for selecting subjects produces a sample that does not represent the population of interest, the problem is called
a. lack of accuracy.
b. selection bias.
c. nonresponse bias.
d. response bias.
Q. 2A survey based on a random sample of 1000 students found that 1 of these students, when asked by the professor doing the survey, admitted to having cheated on at least one exam. The results of this study, if applied to all students in the university, are questionable because of
a. lack of accuracy.
b. selection bias.
c. nonresponse bias.
d. response bias.
Q. 3A survey-taker randomly selected 1000 students who were studying in the library and found that 90 of these students were in favor of longer library hours. The results of this study, if applied to all students in the university, are questionable because of
a. lack of accuracy.
b. selection bias.
c. nonresponse bias.
d. response bias.
Q. 4For a survey of American diets a random sample of 1000 people were contacted. Of the 1000 people, 340 people completed the questionnaire. The results of this study, if applied to all Americans, are questionable because of
a. a large margin of error.
b. selection bias.
c. nonresponse bias.
d. response bias.
Q. 5Which of the following is not an advantage of a sample survey over a census?
a. A sample survey can be used when a census isn't possible.
b. It is much faster to collect a sample than a census.
c. A sample survey allows the researcher to devote the resources to getting the most accurate information possible.
d. Survey results have a good chance to be biased.
Q. 6A census differs from a sample survey because
a. a sample survey is only done when measuring the units will destroy them.
b. a census is only done when measuring the units will destroy them.
c. in a sample survey the whole population is measured.
d. in a census the whole population is measured.
Q. 7For which of the following situations would a census be more useful than a sample survey?
a. To determine what percent of the adults in a state are unemployed.
b. To estimate how many of the 200 physicians in a large city accept patients on welfare.
c. To estimate how many homeless people there are in a city.
d. To estimate how many of the students at a large university are in favor of a proposed fee increase to fund more parking.
Q. 8A national polling organization wishes to estimate the percentage of all teenagers who believe social security will 'be there' for them. The organization surveys a random sample of 1500 teenagers and 37 of this sample says that they believe social security will 'be there' for them. In this survey, what is the population of interest?
a. The 1500 teenagers who were surveyed.
b. Teenagers who believe social security will 'be there' for them.
c. All teenagers.
d. The people in the sample who believe social security will 'be there' for them.
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