The Professor of a Business Statistics Class Wanted to Find

True/False

The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class.Among the 50 students in her class,20% were freshmen,50% were sophomores and 30% were juniors.She decided to select 2 students randomly from the freshmen,5 randomly from the sophomores and 3 randomly from the juniors.This is an example of a systematic sample.