Table 3.

Statistical power of the between-group within-group test T _BW (25): σ _μ = 1

			k = 5		k = 10
N per group	Δ BW	C α	φ BW	${\tilde{\phi }}_{\mathsf{B}\mathsf{W}}$	φ BW	${\tilde{\phi }}_{\mathsf{B}\mathsf{W}}$
30	0.4	0.5	0.194	0.179	0.183	0.194
		0.6	0.268	0.264	0.254	0.268
		0.7	0.387	0.375	0.359	0.387
		0.8	0.591	0.618	0.594	0.591
		0.9	0.908	0.884	0.901	0.908
50	0.3	0.5	0.164	0.184	0.214	0.184
		0.6	0.242	0.254	0.261	0.254
		0.7	0.387	0.367	0.365	0.367
		0.8	0.511	0.564	0.591	0.564
		0.9	0.893	0.889	0.893	0.889

Note: N per group: number of subjects per group; k: number of items; ${\Delta }_{\mathsf{B}\mathsf{W}}={\delta }_{\mathsf{B}\mathsf{W}}/{\sigma }_{\mu }$; C _α: Cronbach alpha; φ _BW: theoretical power (27); ${\tilde{\phi }}_{\mathsf{B}\mathsf{W}}$: simulation-based empirical power