Final answer:
The internal-external locus of control measures the extent to which a person feels they can control events in their lives. Individuals with an internal locus of control attribute outcomes to their actions, while those with an external locus believe outcomes are due to external factors.
Step-by-step explanation:
The internal-external locus of control measure refers to a person's belief system about the extent to which they feel they have the ability to control or affect events and outcomes in their lives. People with an internal locus of control believe that they have personal power and influence over their successes and failures, typically attributing outcomes to their own actions. Conversely, those with an external locus of control attribute their experiences to external factors, such as luck, fate, or other people, and may believe that they have little control over what happens to them.
Jane, in the provided example, who attributes her bad grade to her professor's personal opinion of her, likely has an external locus of control.