Joanne will not go out at night because she hears from her local news station about the large number of muggings and robberies that occur in her city. however, crime in joanne's city has actually gone down in the past few years. to which bias is joanne falling victim?

 The answer to this question is the availability heuristic
the availability heuristic refers to a mental technique that relies on a certain examples when evaluating speciific topic.
In this particular case, the negative events that happens toward other people when they went out at  night influence Joanne decision when she evlauate whether she should go out at night or not.

Smelly rocks sink in water haha!