The legal rule requiring that al evidence illegally obtained by police in violation of the bill of rights a must be excluded from admission in court of law is called

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