Answer
significant at both a = .01 and a = .05
Work Step by Step
z = $\frac{p - p0}{\sqrt \frac{p0(1-p0)}{n}}$ = $\frac{.7 - .5}{\sqrt \frac{.5(1-.5)}{40}}$ = 2.53
This is significant for both $ \alpha = .05 \text{ and} \ \alpha = .10 $
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 22 - Inference about a Population Proportion - Check Your Skills - Page 533: 22.23
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