Valid Statistical Rationales for Sample Sizes

This webinar explains the logic behind sample-size choice for several statistical methods that are commonly used in verification or validation efforts, and how to express a valid statistical justification for a chosen sample size.

The statistical methods discussed during the webinar include the following:

Confidence intervals
Process Control Charts
Process Capability Indices
Confidence / Reliability Calculations
MTBF Studies ("Mean Time Between Failures" of electronic equipment)
QC Sampling Plans
Why should you Attend
Almost all manufacturing and development companies perform at least some verification testings or validation studies of design-outputs and/or manufacturing processes, but it is sometimes difficult to explain the rationale for the sample sizes used in such efforts.

This webinar provides guidance on how to justify such sample sizes, and thereby indirectly provides guidance on how to choose sample sizes. Those justifications can then be documented in Protocols or regulatory submissions, or can be given to regulatory auditors who may ask for them during onsite audits at your company.

Thus, this webinar is designed to help you avoid regulatory delays in product approvals and to prevent an auditor from issuing you a nonconformity.

NOTE: This webinar does not address rationales for sample sizes used in clinical trials.

Areas Covered in the Session
Examples of regulatory requirements related to sample size rationale
Sample versus Population
Statistic versus Parameter
Rationales for sample size choices when using
Confidence Intervals
Attribute data
Variables data
Statistical Process Control C harts (e.g., XbarR)
Process Capability Indices (e.g., Cpk )
Confidence/Reliability Calculation
Attribute data
Variables data (e.g., K-tables)
Significance Tests ( using t-Tests as an example )
When the "significance" is the desired outcome
When "non-significance" is the desired outcome (i.e., "Power" analysis)
AQL sampling plans
Examples of statistically valid "Sample-Size Rationale" statements
Who Will Benefit
QA/QC Supervisor
Process Engineer
Manufacturing Engineer
QA/QC Technician
Manufacturing Technician
R&D Engineer
Speaker Profile
John N. Zorich has spent almost 40 years in the medical device manufacturing industry; the first 20 years were as a "regular" employee in the areas of R&D, Manufacturing, QA/QC, and Regulatory; the next 15 years were as a consultant in the areas of QA/QC and Statistics. These last few years were as a trainer and consultant in the area of Applied Statistics only. His consulting clients in the area of statistics have included numerous start-ups as well as large corporations such as Boston Scientific, Novellus, and Siemens Medical.

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