Two different analytical tests can be used to determine the impurity level in steel alloys. Eight specimens are tested using both procedures, and the results are shown in the following tabulation. Is there sufficient evidence to conclude that both tests give the same mean impurity level, using a = 0.01?

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Specimen Test 1 Test 2 1.2 1.4 1.3 1.7 1.5 1.5 1.4 1.3 1.7 2.0 6. 1.8 2.1 1.4 1.7 1.3 1.6