
Chapter 10
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Statisticians present the information obtained using hypothesis-testing procedure to the
decision makers. Decisions are made on the basis of this information. Ultimately, a decision
maker decides that a statistically signi cant result is a substantive result and needs to be imple-
mented for meeting the organization’s goals.
10.4 TWO-TAILED AND ONE-TAILED TESTS OF HYPOTHESIS
There are two types of tests of hypothesis. They are two-tailed tests and one-tailed tests of
hypothesis. Hypothesis formulation provides a base for test selection. This will be discussed in
detail in the succeeding chapters.
10.4.1 Two-Tailed Test of Hypothesis ...