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Unformatted text preview: : , , . given 2 of the following alpha beta n Summarized: Xbar chart control (exam definite)-Case 1: , , = + * = - * 2known so UCL 3 n and LCL 3 n if data in , this interval then in control-Case 2 , 2unknown so we calculate sample mean & sample var for each set of data. Then average it. = + xbar xbar1 xbar2 xbarkk = + + Sbar Sbar1 Sbar2 Skk = + * * =- * * UCL xbar 3 Sbarn cn and LCL xbar 3 Sbarn cn S Chart Control (hw only)-2known = * ESi cn =-Si 21 c2n ( -( ) n 32 1 c2 n -2unknown-Estimate bySbarcn-- Sbar 3Sbar1c2n 1 --Fraction Defective Control (exam definite)-Fraction defective prob. as p. -p is known-= =-EF P VarF p1 pn -p1 pn is the fraction. Total # defective: -np Zp1 pn-p unknown-Use estimator for p:-Estimate p by Fbar -Fbar 3Fbar1 Fbarn--...
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- Summer '08