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Figure 2: Noise reduction statistic for A-weighting (NRSA) computed for each instruction modality for the two groups of subjects tested with the EAR Classic formable earplug. The NRSA80 are the filled symbols and the NRSA20 are the open symbols. The error bars represent the 95% confidence interval

Figure 2: Noise reduction statistic for A-weighting (NRSA) computed for each instruction modality for the two groups of subjects tested with the EAR Classic formable earplug. The NRS<sub>A80</sub> are the filled symbols and the NRS<sub>A20</sub> are the open symbols. The error bars represent the 95% confidence interval