solved 1-Researchers are interested in whether studying in the presence of

1-Researchers are interested in whether studying in the presence of a cell phone interferes with retention. Researchers randomly assign participants to a no cell phone condition, a cell phone on the desk condition, or a cell phone on the other side of the room condition. In the example, there are ___ levels of the independent variable.A-4B-2C-3D-12-Keyanna is interested in whether level of attractiveness influences helping behavior. To examine this, Keyanna sets up an experiment in which a man passes participants in the hallway and drops his books. Keyanna then measures how many participants stop to help the man. There are three conditions: a condition in which the man is of average attractiveness, another where the man is perceived as stereotypically unattractive, and another condition where the man is perceived as stereotypically attractive. Participants come into the lab once a week for three weeks and are assigned to each of these conditions. Keyanna’s study is an example of a _________ design.1-Within-subjects 2-Survey 3-Between-subject 4-Correlationa