Feb 15, 2011

Direction of Hypothesis Testing

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2-way hypothesis testing is used when investigators have no information regarding the trend of population characteristics that were observed. While the 1-way hypothesis test is used when investigators have information about the direction of trends of population characteristics that were observed. Example below may illustrate.

Example 1: A researcher wants to know the average achievement mahasiswa.Universitas X. According to a growing issue, the average achievement (GPA) of students at the University of X IN THE 3.5. Example 2: A researcher wants to know the average achievement of students at the University X. According to a growing issue, the average achievement (GPA) of students at the University of X is 3.5

Based on the two cases above, we see that in example 1, there is word ABOVE, while in case 2 there are no words that indicate larger or smaller, but directly on the CPI figure 3.5. This gives information that: GPA student at the University of X is located to the right in the normal curve. While in the example 2 means that the average GPA of students at the University of X in a circle (either to the left or to the right) of 3.5 GPA
Thus, in case 2 did not have 2 the possibility of trend / direction, while in case 1 there is a tendency towards (to the right). Therefore, the exact direction of the hypothesis testing for test case 1 is a 1-way (in H1 using a mark BIGGER inequalities), while in case 2 is testing 2-way (in H1 using the inequality sign "NOT THE SAME AS").

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