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 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 upper control limit (UCL) for a proportion can be calculated using the formula: UCL = p + z * sqrt((p(1-p))/n), where p is the proportion defective (0.01), z is the z-value for 95.5% confidence (approximately 2), and n is the sample size (30). Calculating this gives approximately 0.046.

Defects in Marble Countertops Usually Require the Whole Top to Be