Range Test for the Equivalency of Means Under Unequal Variances

Abstract

In this article, we present a range test using a two-stage sampling procedure for testing the hypothesis that the normal means are falling into a practical indifference zone. Both the level and the power associated with the proposed test are controllable and are completely independent of the unknown variances. Tables needed for implementation are given.

KEY WORDS:

• Indifference zone
• Least favorable configuration
• Power of a test
• Range test
• t distribution
• Unequal variances