Reza tells his friends that he was attacked by wasps and that now he is experiencing strange medical symptoms. A local TV news show runs a story, and in the week after, dozens more people report strange wasp behavior and the same unusual symptoms. This is most closely an example of which phenomenon?

Mass hysteria

Explanation:

In psychology, mass hysteria is a phenomenon that transmits collective illusions of threats, whether real or imaginary, through a population in society as a result of rumors and fear. It is also known as mass psychogenic illness, collective hysteria, group hysteria, or collective obsessional behavior for example, Reza tells his friends that he was attacked by wasps and that now he is experiencing strange medical symptoms.

is this even a question? ? : /

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.