Category: Certification Exams Questions

OPTIONS p chart np chart u chart c chart ANSWER p chart EXPLANATION A p chart is always plotted for proportion of defectives.

OPTIONS Need to collect lesser samples Process shifts detected easily Additional sensitivity by averages charts not justified Process drifts detected easily Correct Option:A Need to collect lesser samples EXPLANATION Plots individual observations (I chart) and moving ranges (MR chart) over time for variables data. Use...

OPTIONS The Average charts are not sensitive to non-normality The Average charts provide tighter controls Average charts best indicate within and between subgroup variation Average charts show mean shift ANSWER The Average charts provide tighter controls EXPLANATION Xbar charts have tighter controls than the I-MR...

OPTIONS When you can collect only one observation per day When it is not feasible to use averages chart for process control When within-subgroup variation is to small relative to batch-batch variation All of the above ANSWER All of the above EXPLANATION All the above...

OPTIONS Xbar R Xbar S P chart EWMA Chart ANSWER EWMA Chart EXPLANATION Correct answer: (D) Control limits in an EWMA chart vary on the lines of an exponential distribution, so EWMA Chart is correct.

OPTIONS Sub group statistics are important to be representedSub group sigma is generally more accurateSub group sigma doesn’t introduce unnecessary special causeRange is considered better than Sigma ANSWER Sub group sigma doesn’t introduce unnecessary special cause EXPLANATION The primary for reason for doing what is...

For sum of sub group averages at 2487, number of subgroups is 25 and each subgroup having 5 samples, the control limits for the Averages chart are OPTIONS 91, 108 81, 121 0, 100 70, 131 ANSWER 91, 108 EXPLANATION Using Control Chart constants, the...

For sum of sub group ranges to be at 369 and the number of subgroups is 25 with each subgroup having 5 samples, the control limits for the Range Chart are OPTIONS 0, 25 0, 31 11, 25 11, 31 ANSWER 0, 31 EXPLANATION Using...

The mean of Ranges of a process sample collected across 20 samples is 6, and the mean of averages is 10 with the sample size of 8 per sample. The Control limits for the Averages charts are OPTIONS 6,14 7, 13 7.76, 12.24 8.1, 11.9...

OPTIONS Xbar – R Xbar – S EWMA I-MR ANSWER I-MR EXPLANATION Of all these charts, I-MR is considered most sensitive to non-normality of data.