Bart is 21 years old and is not sure what kind of work he would like to do after college. Like many Americans his age, Bart has not yet developed a identity.

Explanation:

Vocational identity is the process of identifying one's interest, capacity, goals, and talents. It usually develops at a an age when an individual is close to adulthood.

It is similar to career identity which primarily focuses on building a career that one is interested at, but is more persisting as one tries to develop an identity that meets his/her lifelong aspirations.

Here, since Bart is not sure what kind of work he would like to do after college though he is 21 years, indicates that he has not developed a vocational identity. He has not yet identified what his career objectives, goals, aspirations, and interests are.

f high

explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.