From: Statistical power as a function of Cronbach alpha of instrument questionnaire items
k = 5 | k = 10 | |||||
---|---|---|---|---|---|---|
N per group | Δ BW | C α | φ BW | \({\tilde{\varphi}}_{\mathit{\mathsf{B}}\mathit{\mathsf{W}}}\) | φ BW | \({\tilde{\varphi}}_{\mathit{\mathsf{B}}\mathit{\mathsf{W}}}\) |
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 |