Elementary Statistics (12th Edition)

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

Chapter 8 - Hypothesis Testing - Review - Cumulative Review Exercises - Page 435: 5


a) $2.28\%$ b) $39.9$ inches c) $0.9234$

Work Step by Step

a) We find the value of z: $z=\frac{2.8}{1.4}=2$ Hence, using a table of z-scores, we see that $2.28\%$ of men are under $38.8$ inches in sitting height. b) We know that the value of z must be equal to $2.05$ so that $98\%$ of men are accommodated. Hence: $h=(1.4)(2.05)+36=39.87≈39.9$ c. We find the value of z: $z=\frac{1}{(1.4)(.5)}=1.429$ Using an exact value finder given z, we find that the corresponding probability is $0.9234$.
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.