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 0.04 defective. What would you do?
A) Look for assignable causes.
B) Change z to 4 and continue sampling.
C) Nothing; it appears to be random variation.
D) Change z to 2 and take another sample.

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The Answer of 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 0.04 defective. What would you do?
A) Look for assignable causes.
B) Change z to 4 and continue sampling.
C) Nothing; it appears to be random variation.
D) Change z to 2 and take another sample.

Historically, the Average Proportion of Defective Bars Has Been 0