Table 1.

Frequency distributions of the number of dicentrics after exposure to six doses of gamma rays, and the sample means, dispersion coefficients and u values for each distribution. Test data in italics.

	no. dicentrics
dose (Gy)	0	1	2	3	4	$\overline{y}$	d	u
0.25	2185	8				0.004	0.997	−0.113
0.75	2550	44	1			0.018	1.026	0.952
1.00	2231	54	2			0.025	1.044	1.503
1.50	1712	96	3			0.056	1.003	0.092
2.50	1196	123	7	1		0.105	1.038	0.985
3.00	1070	320	41	6	1	0.295	1.012	0.334