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:
Contribution Margin Ratio
A financial metric that measures the proportion of sales revenue that exceeds variable costs, indicating how much revenue contributes to fixed costs and profit.
Variable Costs
Costs that vary in direct proportion to changes in levels of an activity or production volume.
Fixed Costs
These are expenses that do not change with the level of production or sales, such as rent, salaries, and insurance premiums.
Net Income
The total earnings of a company after subtracting all of its expenses, including taxes and operating expenses, from its total revenues.
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