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Chapter 14: Hypothesis Tests – Small Samples
seem to have similar effect in reducing the pain level of the headache and so
neither one of them would have an advantage in reducing the pain level to
zero.
Figure 14-21:
Display of the Confidence Intervals
for
Example14-9
Assuming Unequal Variance (Standard Deviation)
So far, we have assumed equal variances for the two normal populations in
order to test for the difference between the two population means.
What happens if we cannot assume equal variances?
The following procedurewill enable us to accommodate for this restriction.
There are tests we can use to determine whether the variances are equal or
not but will not be discussed in this chapter. Such tests will be presented in
Chapter 16. You can refer to Chapter 16 if you wish.
Click here for the Small Sample Confidence Interval for the Difference Between Two Independent Means Workbook