ALFA ERROR, how do I calculate probability?

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SUMMARY

The discussion centers on calculating the probability of obtaining a failing result for a bulk drug with a purity specification of 98.5% to 101.0% and a precision of σ = 0.92%. The user sought to determine the likelihood of a test result falling outside this specification when the actual purity is 100%. The solution involves applying statistical methods to assess the probability of failure based on the normal distribution of assay results.

PREREQUISITES
  • Understanding of statistical concepts, particularly normal distribution
  • Familiarity with assay precision and its implications
  • Knowledge of purity specifications in pharmaceutical contexts
  • Basic proficiency in probability calculations
NEXT STEPS
  • Learn about normal distribution and its applications in quality control
  • Study statistical process control (SPC) techniques
  • Explore the use of Z-scores in hypothesis testing
  • Investigate methods for calculating confidence intervals in assay results
USEFUL FOR

Pharmaceutical scientists, quality control analysts, and anyone involved in drug assay testing and statistical analysis of purity results.

caramuho
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Hello everybody,

I have the following situation:

A bulk drug has a purity specification of 98.5% to 101.0%. The precision for the bulk drug assay is σ = 0.92%.

How do I calculate the the probability of obtaining a failing result for those cases where the sample is in fact 100% pure? By failing result I mean a result that falls out of specification.

Thanks
 
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OK guys, I already figured it out.
 

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