1. Why was the relationship among people belonging social classes important in order to maintain peace and order in communities? 2. To want extent do people belive that arts and culture can contribute to positive change?

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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