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$z_{\alpha}$ is the value for when the area underneath the right side of the curve is equal to $\alpha$.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 6 - Normal Probability Distributions - 6-2 The Standard Normal Distribution - Page 250: 4
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