Acompany seeks to hire someone who is good at reading emotions from minor, quick changes in people's facial expressions. the company should hire an person. some of us are more sensitive than others to physical cues to various emotions.

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