Defects in marble countertops usually require the whole top to be reconstructed. In one kitchen shop, the percent defective in the past has been one percent. If a sample size of 30 is taken, what should be the 95.5 percent upper control limit be?
A) 0.030
B) 0.000
C) 0.046
D) 0.064
E) None of the above

Question

Quizplus · Accepted Answer

The 95.5 percent upper control limit (UCL) for a sample size of 30 and a defect rate of 1% is 0.046. This can be calculated using the formula UCL = p + 3 * sqrt(p(1-p)/n), where p is the defect rate and n is the sample size.

Defects in Marble Countertops Usually Require the Whole Top to Be