Why do states regulate air and water pollution

The patriot act made it easier for law enforcement agencies to conduct surveillance under certain circumstances true or false

What contributions did muslims make to astronomey

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