The following are the heat-producing capacities ofcoal from two mines (in millions of calories per ton):Mine A: 8,500, 8,330, 8,480, 7,960, 8,030Mine B: 7,710, 7,890, 7,920, 8,270, 7,860Assuming that the data constitute independent randomsamples from normal populations with equal variances,construct a 99% confidence interval for the differencebetween the true average heat-producing capacities ofcoal from the two mines.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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The following are the heat-producing capacities of
coal from two mines (in millions of calories per ton):
Mine A: 8,500, 8,330, 8,480, 7,960, 8,030
Mine B: 7,710, 7,890, 7,920, 8,270, 7,860
Assuming that the data constitute independent random
samples from normal populations with equal variances,
construct a 99% confidence interval for the difference
between the true average heat-producing capacities of
coal from the two mines.

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