Question

a school district has 40 schools located in different neighborhoods of city y. a researcher for the school district believes that teacher job satisfaction varies greatly from school to school. which of the following sampling methods is most appropriate to estimate the proportion of all teachers in the school district who are satisfied with their jobs?
choose 1 answer:
a surveying the 50 teachers who have taught for the school district the longest
b using the first 50 responses from an optional online survey for the teachers
c selecting one of the 40 schools at random and then surveying each teacher at the school
d selecting 5 teachers from each school at random and then surveying each teacher selected

Explanation:

A is biased as it only includes long - serving teachers. B is a voluntary response sample and may have bias. C only samples one school and may not represent all schools. D is a stratified random sample where each school (strata) is represented, which is good when satisfaction varies by school.

Answer:

D. Selecting 5 teachers from each school at random and then surveying each teacher selected