  We present data from two online human-robot interaction experiments where 227
participants viewed videos of a humanoid robot exhibiting faulty or non-faulty
behaviours while either remaining mute or speaking. The participants were asked
to evaluate their perception of the robot's trustworthiness, as well as its
likeability, animacy, and perceived intelligence. The results show that, while
a non-faulty robot achieves the highest trust, an apparently faulty robot that
can speak manages to almost completely mitigate the loss of trust that is
otherwise seen with faulty behaviour. We theorize that this mitigation is
correlated with the increase in perceived intelligence that is also seen when
speech is present.
