The population in this study. One of the students of secondary schools. Nakhon Ratchasima year 2557, the area under the jurisdiction of Secondary Education 31 71 526 the number of
samples used in this study of secondary school students. Nakhon Ratchasima year 2557, the Office of Secondary Educational Service Area 31 neighborhood of 398 people, and another 20 percent increase in the number of samples for a total of 480 people were selected by multistage random sampling.
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