Octave Band Attenuation Data
Octave Band Attenuation Data : Mean: The average attenuation at a particular frequency when measured on a number of people. SD: The standard deviation of the data obtained from measurements on a number of people. Standard deviation is a statistical value that is a measure of the variation in the results of the measurements. APV: The assumed protective value of a particular protector at a particular frequency. The value is obtained by subtracting one standard deviation from the mean value