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To compare two classes of fender protectors, six of each class were mounted on a certain...

To compare two classes of fender protectors, six of each class were mounted on a certain brand of compact car. So each car was rammed into a concrete wall at 5 mph, and the following are the repair costs (in dollars)

Fender protectors 1 127 168 143 165 122 139
Fender protectors 2 154 135 132 171 153 149

Test at the 0.01 level of significance if the difference between the means of these two samples is significant.

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