In order to estimate the difference between the average Miles per Gallon of two different models of automobiles, samples are taken and the following information is collected. 
a.At 95% confidence develop an interval estimate for the difference between the average Miles per Gallon for the two models.
b.Is there conclusive evidence to indicate that one model gets a higher MPG than the other? Why or why not? Explain.
Definitions:
Total Direct Labor Variance
The difference between the actual cost of direct labor used to produce goods and the standard cost of direct labor expected for those goods.
Rate
A measure, quantity, or frequency, typically one measured against another quantity or measure.
Hours
Units of time, each equal to 60 minutes, used often as a measure for billing, labor, or scheduling.
Direct Labor Time Variance
The difference between the estimated time for direct labor to complete a task and the actual time taken, indicating efficiency or productivity issues.
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