In a large city school system with 20 elementary schools, the school board is co
ID: 3151864 • Letter: I
Question
In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan.
a) If they put a big ad in the newspaper asking people to log their opinions on the PTA Web site what kind of bias might they encounter.
response bias due to desire to give acceptable answers
nonresponse bias
bias due to the use of a voluntary response sample
bias due to a poor sampling frame resulting in undercoverage
no bias
b) If they randomly select one of the elementary schools and contact every parent by phone, what kind of bias is there?
bias due to the use of a voluntary response sample
response bias due to desire to give acceptable answers
undercoverage bias due to a poor sampling frame
no bias
nonresponse bias
c) Suppose they randomly select 20 parents from each elementary school. Send them a survey, and follow up with a phone call if they do not return the survey within a week. What kind of sampling was done?
stratified sampling
convenience sample
simple random sampling
voluntary response sample
Explanation / Answer
a) If they put a big ad in the newspaper asking people to log their opinions on the PTA Web site what kind of bias might they encounter.
Only those who volunteer to answer will participate, so,
bias due to the use of a voluntary response sample [ANSWER]
****************************
b) If they randomly select one of the elementary schools and contact every parent by phone, what kind of bias is there?
If we choose just one school, then the answers may not be independent, so
undercoverage bias due to a poor sampling frame [ANSWER]
******************************
c) Suppose they randomly select 20 parents from each elementary school. Send them a survey, and follow up with a phone call if they do not return the survey within a week. What kind of sampling was done?
As there are natural groups, and we get a sample from each group, then it is
stratified sampling [ANSWER]
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.