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Determining Sample Sizes
The procedures for finding the sample size
necessary to estimate 2 are much more
complex than the procedures given earlier for
means and proportions. Instead of using very
complicated procedures, we will use Table 7-2.
STATDISK also provides sample sizes. With
STATDISK, select Analysis, Sample Size
Determination, and then Estimate St Dev.
Minitab, Excel, and the TI-83/84 Plus calculator
do not provide such sample sizes.
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