Answer
When we say that the confidence interval
methods of this section are robust
against departures from normality, it
means that the methods work
well with distributions that are not
normal, provided that departures from
normality are not too extreme. The
given dotplot satisfies
the loose normality requirement.
Since there are 40 dots, the sample
size of 40 satisfies the condition of
n > 30.
Work Step by Step
When we say that the confidence interval
methods of this section are robust
against departures from normality, it
means that the methods work
well with distributions that are not
normal, provided that departures from
normality are not too extreme. The
given dotplot satisfies
the loose normality requirement.
Since there are 40 dots, the sample
size of 40 satisfies the condition of
n > 30.
