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Figure 4: Noise reduction statistic for A-weighting (NRSA) computed for each instruction modality for the two groups of subjects tested with the Howard Leight Fusion pre-molded earplug. The NRSA80 are the filled symbols and the NRSA20 are the open symbols. The error bars represent the 95% confidence interval

Figure 4: Noise reduction statistic for A-weighting (NRSA) computed for each instruction modality for the two groups of subjects tested with the Howard Leight Fusion pre-molded 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