SPC Data Collection & Interpretation

Question 1

Which type of data is used when counting defects in a product?

Accepted Answer

Attribute data

Answer

Attribute data involves counts such as the number of defects or defective items.

Question 2

What is the main benefit of using random sampling in SPC?

Accepted Answer

It reduces sampling bias

Answer

Random sampling reduces bias and provides a representative snapshot of the process.

Question 3

Which chart is best for monitoring continuous measurement data?

Accepted Answer

X-bar chart

Answer

X-bar charts are designed to track the average of variable (measurement) data in subgroups.

Question 4

What does the term 'bias' refer to in measurement systems?

Accepted Answer

Systematic error from true value

Answer

Bias is the difference between the observed average measurement and the true value.

Question 5

Which factor impacts the reliability of data interpretation the most?

Accepted Answer

Measurement system quality

Answer

The accuracy and precision of the measurement system directly impact how reliable data interpretation is.

(SPC) Statistical Process Control Certification Practice Test