Acult in the 1950s believed that the world was coming to an end very soon. researcher leon festinger and his colleagues studied this cult by joining the group and pretending to share these beliefs. what research method were they using?

I think its Participant Observation

Explanation:

In participant observation studies, the researcher becomes (or is already) part of the group to be observed. This involves fitting in, gaining the trust of members of the group and at the same time remaining sufficiently detached as to be able to carry out the observation. The observations made might be based on what people do, the explanations they give for what they do, the roles they have, relationships amongst them and features of the situation in which they find themselves. The researcher should be open about what s/he is doing, give the participants in the study the chance see the results and comment on them, and take their comments seriously.

it is definitely false.

the suction machine and tubing is the equipment that should be left behind and should be most easily accessible.