TABLE IV.

Lognormal t-test on percent differences in exposure for 0.528 m/s (104 fpm) vs. 0.406 m/s (80.0 fpm)

Job Class	N	Mean	Std Dev	Std Err	Minimum	Maximum	95% CL	95% CL	t Value	Pr > |t|
Hosemen	24	−33.69	41.19	8.408	−155.6	29.94	−51.08	−16.29	−4.01	0.0006*
Sprayers	24	0.4488	14.39	2.938	−26.12	23.64	−5.629	6.526	0.15	0.8799
All (means)	8	−16.62	26.69	9.437	−68.40	10.09	−38.93	5.697	−1.76	0.1216

Note: Significance at the 0.05 level is indicated by *.