Population and sample A population-based study in this time is for students who are studying in the Chiang Mai University undergraduate, from which the statistical data of the information agency, Chiang Mai University. I found that in the year of the 2557 (2014) students in all undergraduate men 28207. To set an example of this study will be used to determine, for example, Taro's Yamanaka ne (Taro Yamane) (ARI, 2547 (2004))The formula n = N/((1 + Ne ^ 2)) When n is the sample size.N is the population size.E is the bias of the sample group. The unexpected movement of the sample moves from actual value. 5% or (e = 0.05) to replace the population into a formula to get up. As follows:n = 28,207/((1+28,207( 〖0.05〗^2 ))) = 399.98582 Therefore, the calculated number of samples is equal to 400 samples.Sample size is 399.98582, for example, or approximately 400 samples.
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