A random sample of 10 pairs of identical houses was
A random sample of 10 pairs of identical houses was chosen in a large Midwestern city, and a passive solar heating system was installed in one house from each pair. The total fuel bills (in dollars) for three winter months for these homes were then determined, as shown in the accompanying table. Assuming normal population distributions, find a 90% confidence interval for the difference between the two population means.
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