Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 8 - Hypothesis Testing - 8-2 Basics of Hypothesis Testing - Basic Skills and Concepts: 10

Answer

There is sufficient evidence against the claim that the proportion of baby girls is 0.5.

Work Step by Step

The sample proportion is equal to the proportion of the sample (x) divided by the sample size: $p=\frac{x}{n}=\frac{879}{945}=0.9302.$ The sample proportion of 0.9302 is not really close to the expected 0.5 and not is likely to happen. Hence there is sufficient evidence against the claim that the proportion of baby girls is 0.5.
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