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A manufacturer claims that the mean driving cost per mile of its minivans is less than...

A manufacturer claims that the mean driving cost per mile of its minivans is less than that of its minivans is less than that of its leading competitor. You conduct a study using 34 randomly selected minivans from the manufacture and 38 from the leading competitor. The results are shown at the right. At alpha = 0.10, can you support the manufacturer’s claim? Assume the population variances are equal.


manufactuer
x1= $0.52/ mi
s1= $0.08/ mi
n1= 34


competitor
x2= $0.54/ mi
s2= $0.07/ mi
n2= 38
Math   Statistics-And-Probability   
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