Given the following information about a hypothesis test of the difference between two means based on independent random samples,which one of the following is the correct rejection region at a significance level of .05? 
Definitions:
Operating Period
The span of time during which a business or a particular machinery is operational or in use.
Net Operating Income
Revenue from the primary business activities of a company, with no deductions for interest and taxes.
Variable Manufacturing Overhead
Variable manufacturing overhead refers to the manufacturing costs that vary with the level of production output, such as utilities and certain labor costs.
Variable Cost
Costs that vary directly with the level of production or volume of output.
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