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.

The correct answer is: Directional.

Explanation:

The directional hypothesis can be understood as a prediction that is made by a researcher in which he/she expects either a positive or a negative change in the relationship between two variables of any given population.

These hypotheses can be made based on past experiments, the study of different research papers and empirical evidence.

In this particular case, 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 Directional research hypothesis.

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answer; the parasympathetic nervous system;