Historically, the Average Proportion of Defective Bars Has Been 0

question 36

Multiple Choice

Historically, the average proportion of defective bars has been 0.015. Samples will be of 100 bars each. Construct a p- chart using z = 3. Suppose a sample had 0.07 defective. What would you do?

• A) Look for assignable causes.
• B) Nothing; it is just random variation.
• C) Change z to 2 and take another sample.
• D) Change z to 4 and continue sampling.

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