In a large city school system with 44 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. listed below are some of the ideas proposed for gathering data. for each, indicate what kind of sampling strategy is involved and what (if any) biases might result. assume the schools are homogeneous and differ from each other.
a)randomly select 50 parents from each elementary school. send them a survey, and follow up with a home visit if they do not return the survey within a week.
which kind of sampling strategy is involved?
a. this sampling strategy is a voluntary response sample.
b. this sampling strategy is a simple random sample
c. this sampling strategy is convenience sampling
d. this sampling strategy is stratified sampling.