R Programming Language Certification Quality Control & Assurance 2

Question 1

Which R package provides the `qcc` function for creating Shewhart control charts?

Accepted Answer

qcc

Answer

The `qcc` package provides the `qcc()` function for Shewhart quality control charts including Xbar, R, S, and p charts.

Question 2

In R's `qcc` package, what does an OC (Operating Characteristic) curve represent?

Accepted Answer

The probability of detecting a shift vs. shift size

Answer

An OC curve plots the probability that a control chart will NOT signal an out-of-control condition against various shift magnitudes.

Question 3

What R function from the `qualityTools` package fits a distribution to quality data using maximum likelihood estimation?

Accepted Answer

fitdistr()

Answer

`fitdistr()` from the `MASS` package (also accessible via qualityTools workflows) fits distributions by MLE, though `qdist()` is specific to qualityTools.

Question 4

In acceptance sampling using R, what does the 'AQL' stand for in the context of the `AcceptanceSampling` package?

Accepted Answer

Acceptable Quality Level

Answer

AQL (Acceptable Quality Level) is the worst tolerable process average in a continuing series of lots that is considered acceptable.

Question 5

Which R function calculates process sigma level from a Cpk value?

Accepted Answer

sigma_level <- Cpk * 3 + 1.5

Answer

The sigma level is approximated as Cpk × 3 + 1.5, accounting for the 1.5-sigma long-term shift assumed in Six Sigma methodology.

R Programming Language Certification Practice Test

R Programming Language Certification Practice Test

R Programming Language Certification Quality Control & Assurance 2