ACT scores of a sample of UTC students are shown below. 
a.Compute the mean and the variance.
b.At 95% confidence, test to determine whether or not the variance of the ACT scores of the population of UTC students is significantly more than 8.
Definitions:
Excitatory Signals
These are biochemical impulses that promote or increase neural activity or the firing of neurons.
All-or-none Response
A biological principle indicating that a nerve or muscle fiber reacts completely or not at all to a stimulus.
Sodium/Potassium Pump
A vital cell membrane protein that pumps sodium out of cells and potassium into cells, maintaining the necessary concentration gradients for nerve impulse transmission and muscle contractions.
Positively Charged Ions
Particles, either atoms or molecules, which have become positively charged by losing one or more electrons.
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