Answer
z=10.33.
Work Step by Step
$z=\frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{\sqrt n}}}=\frac{0.89-0.75}{\sqrt{\frac{0.75(1-0.75)}{\sqrt {1021}}}}=10.33.$
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 8 - Hypothesis Testing - 8-2 Basics of Hypothesis Testing - Page 391: 13
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