STP 231 Exam 1 Study Guide With
Complete Solutions
It is flawed because it is a voluntary response sample. - ANSWER Determine
whether the sampling method described below appears to be sound or is
flawed.
In a survey of 628 subjects, the following question was posted on a newspaper's
website: "In your view, are nuclear plants safe?" The survey subjects were
Internet users who chose to respond to the question posted on the electronic
edition of the newspaper.
What is 47% of 3167 adults?
1488.491
adults
b. Could the result from part (a) be the actual number of survey subjects who
have at least one chronic condition?
No, the result from part (a) could not be the actual number of survey subjects
because a count of people must result in a whole number.
Your answer is correct.
c. What is the actual number of survey subjects who have at least one chronic
condition?
A possible value for the actual number of survey subjects is 1489 adults.
d. Among those surveyed, 1481 were called by landline and 1686 were called by
cell phone.
What percentage of the survey subjects were called by landline?
46.8% - ANSWER In a survey of
3167
randomly selected U.S. adults,
47%
reported that they have at least one chronic health condition, such as diabetes
or high blood pressure. Complete parts (a) through (d) below.
Quiz scores from a college level statistics course are analyzed to determine
student progress. - ANSWER Which of the following is NOT a voluntary response
sample?
Question content area bottom
Part 1
, Choose the correct answer below.
A.
Quiz scores from a college level statistics course are analyzed to determine
student progress.
Your answer is correct.
B.
A radio station asks for call-in responses to a question concerning city
recycling.
C.
A survey is taken at a mall by asking passersby if they will fill out the survey.
D.
A local dentist asks her patients to fill out a questionnaire and mail it back to
determine the quality of the care received during an office visit.
sampling method - ANSWER Fill in the blank.
If we are collecting sample data for a study, the _______ that we choose can
greatly influence the validity of our conclusions. For example, we can use sound
statistical methods to analyze data in voluntary response samples, but the
results are not necessarily valid.
The study is
an observational study,
since
the subjects were not given any treatment. - ANSWER A study of an association
between which ear is used for cell phone calls and whether the subject is left-
handed or right-handed was conducted. The study began with a survey e-mailed
to
5000
people belonging to an otology online group, and
717
surveys were returned. (Otology relates to the ear and hearing.) Is the study an
experiment or an observational study? Explain.
Cluster - ANSWER For the following scenario, identify which of these types of
sampling is used: random, systematic, convenience, stratified, or cluster.
A researcher collects sample data by dividing a floorplan of the hospital into
sections and choosing all employees in three of them.
This is an experiment because the researchers apply a treatment to the
individuals.
What is a major problem with the study?
The results apply only to male physicians. - ANSWER Question content area top
Part 1
Complete Solutions
It is flawed because it is a voluntary response sample. - ANSWER Determine
whether the sampling method described below appears to be sound or is
flawed.
In a survey of 628 subjects, the following question was posted on a newspaper's
website: "In your view, are nuclear plants safe?" The survey subjects were
Internet users who chose to respond to the question posted on the electronic
edition of the newspaper.
What is 47% of 3167 adults?
1488.491
adults
b. Could the result from part (a) be the actual number of survey subjects who
have at least one chronic condition?
No, the result from part (a) could not be the actual number of survey subjects
because a count of people must result in a whole number.
Your answer is correct.
c. What is the actual number of survey subjects who have at least one chronic
condition?
A possible value for the actual number of survey subjects is 1489 adults.
d. Among those surveyed, 1481 were called by landline and 1686 were called by
cell phone.
What percentage of the survey subjects were called by landline?
46.8% - ANSWER In a survey of
3167
randomly selected U.S. adults,
47%
reported that they have at least one chronic health condition, such as diabetes
or high blood pressure. Complete parts (a) through (d) below.
Quiz scores from a college level statistics course are analyzed to determine
student progress. - ANSWER Which of the following is NOT a voluntary response
sample?
Question content area bottom
Part 1
, Choose the correct answer below.
A.
Quiz scores from a college level statistics course are analyzed to determine
student progress.
Your answer is correct.
B.
A radio station asks for call-in responses to a question concerning city
recycling.
C.
A survey is taken at a mall by asking passersby if they will fill out the survey.
D.
A local dentist asks her patients to fill out a questionnaire and mail it back to
determine the quality of the care received during an office visit.
sampling method - ANSWER Fill in the blank.
If we are collecting sample data for a study, the _______ that we choose can
greatly influence the validity of our conclusions. For example, we can use sound
statistical methods to analyze data in voluntary response samples, but the
results are not necessarily valid.
The study is
an observational study,
since
the subjects were not given any treatment. - ANSWER A study of an association
between which ear is used for cell phone calls and whether the subject is left-
handed or right-handed was conducted. The study began with a survey e-mailed
to
5000
people belonging to an otology online group, and
717
surveys were returned. (Otology relates to the ear and hearing.) Is the study an
experiment or an observational study? Explain.
Cluster - ANSWER For the following scenario, identify which of these types of
sampling is used: random, systematic, convenience, stratified, or cluster.
A researcher collects sample data by dividing a floorplan of the hospital into
sections and choosing all employees in three of them.
This is an experiment because the researchers apply a treatment to the
individuals.
What is a major problem with the study?
The results apply only to male physicians. - ANSWER Question content area top
Part 1
