1. What is Number of Non-Conforming?

Number of Non-Conforming refers to the proportion of products or services in a sample that contain at least one non-conformity or defect. It is a key metric in quality control and statistical process control.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Number of Rejected — Total number of rejected units from the sample
• Number of Sample — Total number of subsets considered from the parent population

Explanation: This formula calculates the proportion of non-conforming items in a given sample, which helps in assessing the quality level of a production process.

3. Importance of Non-Conforming Calculation

Details: Calculating the number of non-conforming items is crucial for quality assurance, process improvement, and identifying areas that require corrective actions in manufacturing and service industries.

4. Using the Calculator

Tips: Enter the number of rejected units and the total sample size. Both values must be valid integers (sample size > 0, rejected units ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: What constitutes a non-conforming item?
A: A non-conforming item is any product or service that fails to meet one or more specified quality requirements or standards.

Q2: How is this different from defect rate?
A: While related, non-conforming rate measures the proportion of items with any defects, while defect rate measures the average number of defects per item.

Q3: What is an acceptable non-conforming rate?
A: Acceptable rates vary by industry and product. Many industries aim for Six Sigma levels (3.4 defects per million opportunities).

Q4: How can this calculation help in quality improvement?
A: By tracking non-conforming rates over time, organizations can identify trends, implement corrective actions, and measure the effectiveness of quality initiatives.

Q5: Should sample size affect the calculation?
A: Yes, larger sample sizes generally provide more accurate estimates of the true non-conforming rate in the population.