Statistics: Informed Decisions Using Data (4th Edition)

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

Chapter 7 - Section 7.2 - Consumer Reports - Sunscreens - Page 380: a

Answer

It is important to first obtain the exposure time without sunscreen and then to determine the exposure time with sunscreen for each person so that the SPF rating can be properly determined. For example, if a person can withstand 5 minutes before being sunburned, after applying the sunscreen of SPF 15, he should be able to withstand 75 minutes of exposure.

Work Step by Step

Given above.
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