A researcher is investigating the use of homeopathic remedies among different socio-economic groups. She has to over-sample Native Americans from her accessible population in order to obtain a representative sample. This is an example of what type of sampling technique:
A) Simple random sampling
B) Systematic random sampling
C) Stratified random sampling
D) Stratified random sampling with differential probabilities

Question

Quizplus · Accepted Answer

This is an example of stratified random sampling with differential probabilities because the researcher is intentionally over-sampling a specific group, Native Americans, to ensure they are represented in the sample. This requires assigning different probabilities of selection to each stratum based on their relative population size and/or their importance for the research question.

A Researcher Is Investigating the Use of Homeopathic Remedies Among