Final answer:
Walter has an external locus of control because he believes that he was abducted by aliens. This belief means that he perceives his outcomes as being outside of his control and is less resistant to social pressure.
Step-by-step explanation:
Walter has an external locus of control because he believes that he was abducted by aliens and that now everything that happens to him is a result of that abduction. This means that he perceives his outcomes as being outside of his control and believes that luck, fate, and other people determine the outcomes. As a result of having an external locus of control, Walter is more resistant to social pressure than people with an internal locus of control, who believe that they have control over their own outcomes.