| Functions | Test value = 3 | |||||
| t | df | Sig. (2-tailed) | Mean difference | 95% CI of the difference | ||
| Lower | Upper | |||||
| High battery capacity | −16.487 | 478 | 0.000 | −1.34058 | −1.5014 | −1.1798 |
| High quality | −25.653 | 478 | 0.000 | −1.31884 | −1.4205 | −1.2172 |
| Modern | −16.758 | 478 | 0.000 | −1.15942 | −1.2962 | −1.0226 |
| Reliability of reception | −20.397 | 478 | 0.000 | −1.26812 | −1.3911 | −1.1452 |
| More features | −20.045 | 478 | 0.000 | −1.21014 | −1.3295 | −1.0908 |