Answer
$$E = 4.537$$
Work Step by Step
1. Find $t_c$:
d.f. = 9 - 1 = 8
According to Table 5, for d.f. = 8 and c = 0.98:
$t_c = 2.896$
2. Calculate E:
$$E = t_c \frac{s}{\sqrt n} = (2.896)\frac{4.7}{\sqrt {9}} = 4.537$$
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: 8
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