6. Why use this formula to calculate the sample size and use the formula for σ
substitution in the study. Use a formula to calculate the sample size to estimate the average values in the case of the known population size (jitima Hangul tantayaporn, Arun, and faculty, 2555 (2012)) reasons choose to use this recipe because the title and the main objective of the study is to describe and study the sample size is calculated from the formula that relates. I found that using this formula to calculate the sample size. And there is the closest most people value and in this recipe. With σ (Sigma Mar), which is the standard deviation. In the research. Province of kalasin, the standard deviation is equal to 0.55 (yawan Kan Si Sawat Phong and the locomotive diversion 2554 (2011), BOA). Where is the research that looks similar to the subject of education, content area, and a unit of the population studying
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