Statistical Quality Control Practice Test 7

1. Cumulative control charts were first presented by ____________

Shewhart

ASQ

ASQC

Page

2. If the process standard deviation increases, how will the cusum chart for monitoring process variability indicate the out-of-control state?

The value of S_i^- will increase

The value of S_i⁺ will decrease

The value of S_i^- will decrease with decrease in the value of S_i⁺

The value of S_i⁺ will increase

3. Which of these show a correct expression for the ρ_p?

\(ρ_p=\frac{\sigma_p^2}{2σ_{Gauge}^2}\)

\(ρ_p=\frac{\sigma_{gauge}^2}{2σ_{total}^2}\)

\(ρ_p=\frac{\sigma_P^2}{σ_{Gauge}^2}\)

\(ρ_p=\frac{\sigma_{gauge}^2}{σ_{Total}^2}\)

4. Which of these can be used as the estimate of standard deviation of total variability which is including both product variability, and the gauge variability?

No of defects in the sample

The sample standard deviation

The sample variance

The sample mean

5. Which of these is an indication of out-of-control process with low standard deviation?

Increase in the value of S_i^-

Increase in the value of S_i⁺

Decrease in the value of S_i⁺ with increase in the value of S_i^-

Decrease in the value of S_i^- with decrease in the value of S_i^-

6. The tabular Cusums are made to monitor the ____________ of the process.

Variance

Mean

Standard deviation

Capability

7. Measurement system can also cause variability in the products.

False

True

8. Tabular Cusums can be constructed for both, individual measurements, and the averages of the rational subgroups.

False

True

9. If the value of C^-_i-1+S²+k is lesser than (-1), what will be the value of C_i^- equal to?

Lower than 0

Lesser than -1

Higher than 1

10. If the value of the cumulative sum shifts to a lower value what is likely to be the reason for it?

Decrement in the value of the standard deviation

No change in the value of mean

The increase in the value of the mean

The decrease in the value of the mean