Aresearcher can't randomly assign offenders to groups, and they have to find volunteers for the control group that does not get the treatment. the volunteers were lower risk than the treatment group. name the internal validity threat:

The defendant and an accomplice were on trial together for burglary. both had given confessions implicating themselves and their accomplice. at trial, the defendant maintained that his confession had been obtained through improper coercion by the police. for the purpose of countering the claim of coercion, the prosecution seeks to place the accomplice’s confession into evidence. after objection by the defendant’s counsel, the judge agrees to issue a limiting instruction to the jury that the confession is to be considered only with regard to the question of whether the defendant’s confession was coerced. may the accomplice’s confession be admitted under that condition?

You are a financial planner and you are preparing for a meeting with your new client, anne. what would you be most likely to ask anne to bring to the meeting with her? a. pictures of her children b. her parents c. any will d. sales records for her ex-husband's business

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?