The article "A Study of Wood Stove Particulate Emissions" (J. of the Air Pollution Control Assoc., 1979: 724-728) reports the following data on burn time (hours) for samples of oak and pine. Test at level .05 to see whether there is any difference in true average burn time for the two types of wood.

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Oak 1.72 67 1.55 1.56 1.42 1.23 1.77 48 Pine 98 1.40 1.33 1.52 .73 1.20