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 An experiment was performed to compare the abrasive wear of two different laminated materials

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 An experiment was performed to compare the abrasive wear of two different laminated materials. Twleve pleces of material 1 were tested and ten pieces of material 2, with the results in units of abrasive wear being:

Material 1: sample average of 85 with a sample standard deviation of 4

Material 2: sample average of 81 with a sample standard deviation of 5

Can we conclude at the 0.05 level of significance that the abrasive wear of material 1 exceeds that of material 2 by more than 2 units? Assume the populations to be approximately normal with equal variances.