Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 6 - Section 6.2 - Assess Your Understanding - Applying the Concepts - Page 345: 39c

Answer

Yes, I would be surprised if fewer than half covered their mouth because the probability of that event happening is 0.02721 which is less than 0.05.

Work Step by Step

If fewer than 5 people covered their mouth when they sneeze, it means that more than half of the people did not cover their mouth when sneezing. As such we have to find $P(x > 5)$ $P(x > 5)$ = $1 - P(x \leq 5)$ = $1-0.97279$ = $0.02721$ ** 0.97279 was obtained using excel because p = 0.267 is not a probability that can be read off of Table IV.
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