When unwelcome sexual conduct has the purpose or effect of unreasonably interfering with job performance or creating an intimidating or offensive work atmosphere, it is known as?

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.        

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer