Section 10.2 Summary

1. Section 10.2 examines inferential methods for , which is the difference between the means of two independent populations. Two-sample tests may be performed using either the -value method or the critical-value method.
2. confidence intervals for are developed and illustrated.
3. The use of confidence intervals for to perform two-tailed tests is illustrated.
4. 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.
5. When the population standard deviations and are known, the data analyst may prefer to use inference for .