A Researcher Wants to Study Ethnic Variations in Students' Study

Multiple Choice

A researcher wants to study ethnic variations in students' study habits at a major university. There are 80% Caucasians, 10% African Americans, and 10% Hispanics at the university. The researcher wants his sample to reflect the proportions of ethnic groups at the university. He would use what type of sampling technique:

A) Simple random sampling
B) Systematic random sampling
C) Stratified random sampling
D) Stratified random sampling with differential probabilities