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 451: 12


a) The claim is supported. b) The claim is supported. c) Yes

Work Step by Step

a) We want to see if the mean is different to $\frac{27}{294}=0.0918$, so we know $H_0:μ=0.0918$ and $H1:μ\lt0.0918$. 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 $p=0.5720$. $p\gt0.05$, hence the claim is not supported. 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 is all negative, so we see that there is a decrease in the Malaria when Bednets are used. c) The results show that Bednets do have an impact on infection rate.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.