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Distribution Analyses |
Figure 38.10: Basic Confidence Intervals Menu
The confidence interval for the mean
has upper and lower limits
For weighted analyses, the limits are
For large values of n, acts as
,the
critical value of the standard normal distribution.
The confidence interval for the standard deviation
has upper and lower limits
For weighted analyses, the limits are
The confidence interval for the variance
has upper and lower limits equal to the squares of
the corresponding upper and lower limits for the standard deviation.
Figure 38.11 shows a table of the 95% confidence intervals for the mean, standard deviation, and variance.
![]() Note | The confidence intervals are set to missing if vardef![]() |
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