| Large Size | Middle Size | Small Size | Total | |||||
---|---|---|---|---|---|---|---|---|---|
 | Mean | Std dev. | Mean | Std dev. | Mean | Std dev. | Mean | F | P* |
Propriety | 1.51 | ± .58 | 1.42 | ± .65 | 1.7 | ± .68 | 1.55 | 5.51 | .005 |
Utility | 1.41 | .52 | 1.29 | .63 | 1.68 | .62 | 1.44 | 7.88 | .000 |
Feasibility | 1.37 | .75 | 1.00 | .75 | 1.55 | .82 | 1.30 | 9.26 | .000 |
Accuracy | 1.48 | .59 | 1.36 | .63 | 1.76 | .64 | 1.48 | 8.95 | .000 |