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Canada economy usa test prep i am stupid i don’t get it

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

Surfaces of paintings—such as paper, canvas, and pottery—are referred to technically as