Applied Reliability and Durability Conference
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2017
North America

Red Room - Session 5

1:00 to 2:00 p.m. Wednesday, June 14, 2017

A Practical Approach for Determining Sample Sizes

How many samples should be tested? This is the million dollar question! There are many papers written about determining sample sizes, and formulas are available to determine statistical sample sizes based on assumptions of distribution, variation, desired error and confidence level. However, there are trade-offs between sample size and resource constraints such as time and cost. The presentation will explore different types of reliability tests and the intention of each test. It will show how simulation can be used to develop boundary ratios which can be used to compare different test plans. Finally, the presentation will address the importance of understanding the selection of the samples to be placed on test.

Key Words: Sample Size, Qualitative Test Methods, Quantitative Test Methods, Simulation, Boundary Ratio, Sampling Strategy

Tearesa Wegscheid

HBM Prenscia

Tucson, Arizona