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Chapter 11: Confidence Intervals – Large Samples
Figure 11- 13:
Workbook Output with the Sample Size
for
Example 11-9
Observe that the required sample size in
Figure 11-13
is computed to be
47.05787. This approximates to a value of 48 the same as that obtained by
using the formula.
Note:
When the population standard deviation
is unknown, we can replace
with the sample standard deviation
s
in the previous equation used to
compute
n
.
Section Review
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