39, 32, and 68 random students are selected from the Sophomore, Junior, and Senior classes with 393, 321, and 681 students respectively. convenience stratified cluster systematic

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 3CST
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What type of sampling technique was used below?

39, 32, and 68 random students are selected from the Sophomore, Junior, and Senior classes with 393, 321, and 681 students respectively.

convenience
stratified
cluster
systematic
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