Section 10.2 Summary
- 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.
- confidence intervals for are developed and illustrated.
- The use of confidence intervals for to perform two-tailed tests is illustrated.
- 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 deviations and are known, the data analyst may prefer to use inference for .