Elementary Statistics (12th Edition)

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

Chapter 9 - Inferences from Two Samples - 9-2 Two Proportions - Basic Skills and Concepts - Page 452: 18


a) The claim is valid. b) The claim is valid. c) The finishing rates are similar for men and women.

Work Step by Step

a) We want to see if the mean is different to $\frac{253}{25221}=0.0100$, so we know $H_0:μ=0.0100$ and $H1:μ\ne0.0100$. We now use a Ti-84 calculator. To solve, go to "Stat," then "Tests," and then select "Stats." Doing this, we can find that the critical value and use a z-table calculator to find that $p=\gt0.00$, hence the claim is valid. b) We use a TI-84 calculator to find the confidence interval. To do this, we press “Stat” and then select “Tests.” Next, we select “2-PropZInt” to conduct the test. Doing this, we can find that the confidence interval goes through $0$, so the claim is valid. c)The results show that men and women do have similar finishing rates for the marathon.
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