Geothermal power is an important source of energy. Since the amount of energy contained in 1 pound of water is a function of its temperature, you might wonder whether water obtained from deeper wells contains more energy per pound. The data in the table are reproduced from an article on geothermal systems by A.J. Ellis.11

Is there a significant positive correlation between average maximum drill hole depth and average maximum temperature?

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Average (max.) Drill Hole Depth (m) Average (max.) Location of Well El Tateo, Chile Ahuachapan, El Salvador Namafjall, Iceland Larderello (region), Italy Matsukawa, Japan Cerro Prieto, Mexico Wairakei, New Zealand Kizildere, Turkey The Geysers, United States 650 1000 1000 600 1000 800 800 700 1500 Temperature (C) 230 230 250 200 220 300 230 190 250