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The following random samples are measurements of the heat-producing capacity (in millions of calories per ton)...

The following random samples are measurements of the heat-producing capacity (in millions of calories per ton) of specimens of coal from two mines:

Mine 1 :   8260  8130  8350  8070  8340

Mine 2:     7950  7890  7900  8140  7920  7840

Use 0.01 level of significance to test whether the difference between the means of these two samples is significant.

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