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FACTOR INFLUENCING THE EVALUATION OF EAR PROTECTIVE DEVICES

机译:影响耳朵保护装置评估的因素

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The primary purpose of this study was to determine the number of subjects and the number of repeat measurements necessary to obtain a reliable value for the average attenuation of an ear plug under specific controlled con¬ditions. Results indicate that satisfactory data would be obtained with ten subjects making three repeat measurements. Approximately the same results would be obtained with six subjects making five replications or 15 subjects mak¬ing one replication.

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