Answer
In trial (i)
Work Step by Step
In trial (i) the difference between the percentages of $49.3\%$ and $69\%$
shows that the treatment group smoked significantly less than the control group. This difference would bias the experiment.
Statistics, 4th Edition
by Freedman, David; Pisani, Robert; Purves, Roger
Published by
W. W. Norton & Company
ISBN 10:
0393929728
ISBN 13:
978-0-39392-972-0
Chapter 1 - Part 1 - Design of Experiments - Exercise Set A - Page 20: 7
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