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A school wants every grade represented, so it samples inside each grade. That is a:

AStraightened sample
BStrengthened sample
CStraddled sample
DStratified sample
Answer & Solution
Correct answer: D. Stratified sample
1. The population is split into groups first. 2. A random draw happens inside each group. 3. That is a stratified sample. _Source: OpenStax Contemporary Mathematics, Chapter 8, Statistics._
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