An intensive study of the attenuation properties of numerous ear protectors and the statistical treatment of the data obtained, explains and/or documents many previously suspected or noted irregularities in measurement procedures. Detailed data on subjective measurement, directionality, linearity, and asymmetry of attenuation of ear protectors were collated. These findings will be presented along with a description of the nonparametric statistics used to ascertain central tendencies, sources and magnitudes of variability, and degrees of correlation of the data. In the study, nine ear protectors, 10 trained subjects, and two artificial heads were utilized. The USA Standards Institute's method (i.e., free-field threshold shift) was used to obtain subjective measurements. The artificial heads were employed for the acquisition of detailed information on the noise-exclusion properties of each ear protector.
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