Answer
The random assignment of people and application sites to each treatment is important as different people have different types of skin and sensitivity to sunlight. This will avoid any possible sources of bias.
Work Step by Step
Given above.
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 7 - Section 7.2 - Consumer Reports - Sunscreens - Page 380: b
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