biological and other non-gaussian type, noises, a greater 

 number of rejected samples is to be expected. The table 

 also shows that for kurtosis the expected number (one out 

 of 20) was exceeded for both of the shallow-water locations 

 but was not exceeded for the deep-water (North Pacific) 

 location. For the ship-noise samples, the number of ex- 

 pected significant values of skewness and kurtosis are ex- 

 ceeded at all levels. Of interest are the number of sig- 

 nificant values of skewness in the ship-noise data, since 

 there were not many of these for the other three groups. 

 For all groups the data indicate that kurtosis is a sensitive 

 indicator for the presence of ship noise, biological noise, 

 ice noise, and in general any type of noise which has a non- 

 gaussian distribution. 



Table 4 indicates the bandwidth of the noise samples 

 which had significant values of skewness and kurtosis at the 

 1 per cent level. For the most part the bandwidths involved 

 are the larger ones. 



TABLE 4. NOISE SAMPLES FROM FOUR LOCATIONS, SHOWING SIGNIFICANT 

 MOMENTS OF SKEWNESS AND KURTOSIS ATI PER CENT PROBABILITY LEVEL. 



SOUTHERN CALIFORNIA 



BERING STRAITS 



BANDWIDTH 



g, d%) 



g 2 (1%) 



20-2500 







5 



20-1500 











BANDWIDTH 



g, (i%) 



g 2 d%) 



BROADBAND 







l 



20-1200 



l 



2 



20-600 







2 



NORTH PACIFIC 



BANDWIDTH 



g, (1%) 



g 2 d%) 



1 OCTAVE 

 1600 c.f. 







2 



1/3 OCTAVE 

 1600 c.f. 







l 



SAN DIEGO (SHIP 

 NOISE IN HARBOR) 



BANDWIDTH 



g, (1%) 



g 2 d%) 



20-1200 



3 



3 



600-1200 







l 



33 



