The lecturer of a business statistics class wanted to find out the average amount of time per week her students spent studying for the class.Among the 50 students in her class,20% were first-year students,50% were second-year students and 30% were third-year students.She decided to draw 2 students randomly from the first-year students,5 randomly from the second-year students and 3 randomly from the third-year students.This is an example of a stratified sample.

Question

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The lecturer used a stratified sampling technique by dividing the students into three strata based on their year level and selecting a specific number of students from each stratum. This ensures that each year level is represented proportionally in the sample and can provide more accurate results.

The Lecturer of a Business Statistics Class Wanted to Find