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Social Studies, 20.01.2020 20:31 koolja3
Aschool district decides to compare a new math textbook with the textbook that has been used for the past few years. each of the fourth graders in one school is randomly assigned to be in one of two classes, one in which a teacher continues using the old book and another in which a new teacher uses the new book. the school administrators compare the average scores of the two classes on a mathematics standardized test at the end of the year to determine which book is better.
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