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need some clearance of idea:

A process produces rubber belts in lots of sizes 2,500. Inspection records on

the last 20 lots reveal the following data:

then u have data in the format:

Lot Number non-conforming belts

1 230

2 235

etc etc etc etc

20 207

need to calculate p-chart for it....so have p-bar = tot. defective/2500*20...right?

what would I use as "n" to calculate the control limits?????? n is sample size so should it be 2500(lot-size here????).

Would appreciate if anyone could clear it out for me

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# Homework Help: P-Chart: Diff. btwn lot & sample size

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