hmY tbn etUjb - Silpakorn University · Dmb^lRYmZWtboonb aYjtd YYq{n{ jG DmbKj`udk[bkDjZFj`^GuZZ\h`\hmY tbn etUjb h~llDfpDgmv[buDb`emibZY nJmtWFvYvdaohmbhYtWfudkDmbhq{jhmb vTa Yma_mYrel

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X = ∑X∑X

SD = n∑X − (∑X)n(n − 1)∑X∑X

p =pPP

r = 1 − ∑rS

IOC = ∑∑R

= KK − 1 1 − ∑pqs

s

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EE∑X∑F




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hmY tbn etUjb - Silpakorn University · Dmb^lRYmZWtboonb aYjtd YYq{n{ jG DmbKj`udk[bkDjZFj`^GuZZ\h`\hmY tbn etUjb h~llDfpDgmv[buDb`emibZY nJmtWFvYvdaohmbhYtWfudkDmbhq{jhmb vTa Yma_mYrel