Answer
$$E = 0.686$$
Work Step by Step
1. Find $t_c$:
d.f. = 35 - 1 = 34
According to Table 5, for d.f. = 34 and c = 0.90:
$t_c = 1.691$
2. Calculate E:
$$E = t_c \frac{s}{\sqrt n} = (1.691)\frac{2.4}{\sqrt {35}} = 0.686$$
Elementary Statistics: Picturing the World (6th Edition)
by Larson, Ron; Farber, Betsy
Published by
Pearson
ISBN 10:
0321911210
ISBN 13:
978-0-32191-121-6
Chapter 6 - Confidence Intervals - Section 6.2 Confidence Intervals for the Mean - Exercises - Page 315: 7
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