Margin of Error (p. 594). For a confidence interval for ,
Sampling distribution of (p. 590)
The pooled variance method for inference may be applied when the data analyst has reason to believe that the variances of the two populations are equal.
When the population standard deviation and are known, the data analyst may prefer to use inference for
Pooled estimate for the common variance (p. 596):
Test statisticfor using pooled variance (p. 596):
Pooled varianceconfidence interval for μ (p. 598):
test statistic for when and are known (p. 598):
confidence interval for when and are known (p. 599):
section 10.3
Confidence Interval for (p. 612).
Margin of error (p. 612). For a confidence interval for ,
Pooled estimate of (p. 608).
Sampling distribution of (p. 607)
Test statistic for the independent samplestest for (p. 608):