People with a(n) decision-making style have a low tolerance for ambiguity and are task oriented. they are efficient, logical, and practical in their approach to solving problems and making decision. which style do they use?

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling