population and sample the population for research
the population used in this study, the general staff is working in the Bangkok metropolitan area, with a number of top
as well as end of 3,886,630 people (National Statistics Office, 2552.)
sample groupThe sample used in the Research Group of this is an Employee working at the Bangkok general
to calculate the size of the sampling group level of welding sat 95% and the level of the false
does not exceed 0.05 by using a ratio formula Determination Sample Size (Yamane, 1973, .1088 p) as follows:
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