A survey was mailed to a total of 400 students; 100 were randomly - 6310

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Request Description

A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used? 

A. Stratified sample 

B. Simple random sample 

C. Cluster sample 

D. Systematic sample 

 
Solution Description

A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior a