Jessica hypothesizes that her manipulation of temperature in an auditorium will increase the number of students who doze off in a lecture. She is testing a hypothesis. Group of answer choices theoretical uniform directional preconceived

directional research          

Explanation:

Directional research hypothesis: In research methods, a "directional research hypothesis" is described as a prediction that is being made by an experimenter or researcher related to the negative or a positive change, difference, or a relationship between two distinct variables of a specific population. The research prediction in directional research hypothesis is generally based on the extensive experience, past research, literature, accepted theory on the topic.

In the question above, the given statement represents the directional research hypothesis.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."