Answer
$$E = 4.938$$
Work Step by Step
1. Find $t_c$:
d.f. = 6 - 1 = 5
According to Table 5, for d.f. = 5 and c = 0.99:
$t_c = 4.032$
2. Calculate E:
$$E = t_c \frac{s}{\sqrt n} = (4.032)\frac{3}{\sqrt {6}} = 4.938$$
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