Algebra II.4.D.24 - Differences Due to Random Assignment Alone – Exit Ticket

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When a single group is randomly divided into two groups, why do the two group means tend to be different?

From EngageNY.org of the New York State Education Department. Grade Algebra II Mathematics Module 4, Topic D, Lesson 24. Internet. Available from https://www.engageny.org/resource/algebra-ii-modul...; accessed 21/Apr/2016.