It has been suggested that night shift-workers show more variability in their output levels than day workers. Below, you are given the results of two independent random samples. 
a.State the null and alternative hypotheses to be tested.
b.Compute the test statistic.
c.Determine the p-value.
d.At 95% confidence, what do you conclude?
Definitions:
Spinal Nerves
Nerves that emerge from the spinal cord and branch out to innervate different parts of the body.
Motor Neurons
Neurons that carry signals from the spinal cord or brain to effectors (muscles or glands) to trigger movement or action.
Patellar Reflex
A knee jerk reflex triggered by tapping the patellar tendon, used to test the neural circuits within the spinal cord.
Effectors
Biological structures that act in response to a signal from the nervous system.
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