Attribute help

Six Sigma – iSixSigma Forums Old Forums General Attribute help

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    Situation:  I do not do much with attribute measures, so I am rusty on that aspect.  I need to get an estimate on sampling sizes soon, so I am asking if I’m doing this right — while at the same time frantically reading .
    Estimate is that id 1,133 boxes that 8 pcs were packaged about 20% of the time.  What is the sample size that would estimate the true % with 95% confidence.
    I’m looking at Breyfogle’s Implimenting 6-Sigma, pg. 429, the formula for n.  Used Ua=1.645 delta 9=.05, p=.8  Got 173 boxes.   
    Like I said, pressure here, am I on the right track?

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