Table 5.

ANOVA testing of “Jitter” for three different age groups in different water volumes.

ANOVA of Jitter	1 mL	3 mL	5 mL	10 mL	20 mL
Between groups df *	2	2	2	2	2
Within groups df *	44	42	41	36	25
F-boundary (α = 0.05)	3.20	3.22	3.22	3.26	3.39
F-value **	1.192	0.754	0.255	1.841	15.818
p-value	0.313	0.477	0.776	0.173	0.001
eta squared η2	0.051	0.035	0.012	0.093	0.559

* Degree of freedom; ** The bold number means that (F-value > F-boundary).