Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 1 - Introduction to Statistics - 1-2 Statistical and Critical Thinking - Page 13: 16

Answer

Neither statistical nor practical significance.

Work Step by Step

The probability of getting these same results if the program is ineffective is too high (25%), hence the result is not statistically significant. The average increase of 3 IQ points is not too much and is certainly far from the increase the program states. Hence, the result is not practically significant.
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