Research Article
Improving Usefulness of Automated Driving by Lowering Primary Task Interference through HMI Design
Table 3
Mauchly’s test against violations of the sphericity assumption.
| | Dependent variable | Effect | | df | |
| | Monitoring ratio | HMI | — | — | — | | Driving situation | 0.92 | 2 | .633 | | HMI driving situation | 1.44 | 2 | .488 |
| | Usefulness of HUD | HMI | — | — | — | | Driving situation | 2.97 | 2 | .226 | | HMI driving situation | 1.85 | 2 | .396 |
| | Usefulness of auditory output | HMI | — | — | — | | Driving situation | 0.63 | 2 | .728 | | HMI driving situation | 0.24 | 2 | .887 |
| | Visual workload | HMI | — | — | — | | Driving situation | 1.97 | 2 | .374 | | HMI driving situation | 3.13 | 2 | .209 |
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