Simple random samples of 100 high school students are sampled from each grade level,for a total of 400 high school students.They are asked to rate the performance of the president of the United States on a scale from 1 to 5 (1 = poor and 5 = excellent).The results are presented below. 
What would be the null hypothesis for a chi-square test based on these data?
Definitions:
Executive Functions
Functions of the brain that involve the ability to sustain concentration; use abstract reasoning and concept formation; anticipate, plan, and program; initiate purposeful behavior; self-monitor; and shift from maladaptive patterns of behavior to more adaptive ones.
Prefrontal Cortex
The front part of the frontal lobe of the brain, involved in complex behaviors such as planning, decision making, and moderating social behavior.
Hippocampus
A critical region of the brain involved in memory formation and spatial navigation.
Hypothalamus
A region of the brain below the thalamus that coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems.
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