Let’s say that Jon visits a museum/national park/zoo/attraction and is led through the experience by a guide, Sarah. Sarah is very friendly and funny and personable, but doesn’t know her subject matter very well and actually shares a lot of incorrect information with the visitors.
At the end of the tour, the administration asks Jon and the other visitors to fill out a survey asking how much they learned and seeing how their values changed (“After the tour, are you more interested in art history/nature conservation/cave preservation?”) They all answer quite positively, even though subsequent questions would reveal that they learned almost nothing from their tour. They just answered that way because they really liked Sarah and wanted to please her.
In other words, the likability of the surveying party influenced the accuracy of the actual survey responses.
Is there a name for this type of bias? And bonus question: How might one design a survey to counteract it?