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Facts About Noise #5

What’s wrong with Naive Subject Fit and Experimenter Supervised Fit

You are really getting involved now! You know the difference between Naive Subjects and Supervised Subjects. When hearing protectors are tested in a laboratory 10 subjects are tested three times at nine different frequencies. All this date is translated into mean attenuation values and standard deviations for the nine frequencies. This accumulated data is then compared to test population data collected without the use of hearing protection. The next step is to calculate the NRR from these numbers.

If you have an opinion about the test population question, please let us know. We will periodically publish the results of our informal poll on this page. Will lower NRR's help your company's hearing conservation program?

Read more: Conflicting Information about How to Use the NRR


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