According to data from Johns Hopkins University, as of Tuesday night, 663,913 people in the United States have died from the new crown virus. According to data from the U. S. Census Bureau, as of April 2020, the U. S. population is 331.4 million. Since this summer, as the highly contagious delta variant has become mainstream in the United States, the death rate from the new crown has also risen sharply.

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