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The Proportion Non-Conforming in Sample is a statistical measure that represents the ratio of non-conforming items to the total number of items in a sample. It helps in quality control to determine the defect rate in a production process.
The calculator uses the formula:
Where:
Explanation: The formula calculates the proportion by dividing the number of non-conforming items by the total sample size.
Details: Calculating the non-conforming proportion is essential for quality assurance, process improvement, and identifying areas that need corrective actions in manufacturing and service industries.
Tips: Enter the number of non-conforming items and the total number of items in the sample. Both values must be valid (non-conforming items ≤ total items, total items > 0).
Q1: What is considered a non-conforming item?
A: A non-conforming item is any product or service that fails to meet specified quality standards or requirements.
Q2: How is this proportion used in quality control?
A: It helps monitor process stability, identify trends, and implement quality improvements by tracking defect rates over time.
Q3: What is an acceptable non-conforming proportion?
A: Acceptable levels vary by industry and product. Typically, organizations set internal quality targets based on customer requirements and industry standards.
Q4: Can this calculator handle large sample sizes?
A: Yes, the calculator can handle any sample size as long as the values are within reasonable computational limits.
Q5: How often should non-conforming proportions be calculated?
A: Frequency depends on the process stability and quality requirements. Regular monitoring (daily, weekly, or per production batch) is common practice.