Solar Energy in Different Weather A student of the author lives in a home with a so- lar electric system. At the same time each day, she collected voltage readings from a meter connected to the system and the results are listed in the accompanying table. Use a 0.05 significance level to test the claim that the mean voltage reading is the same for the three different types of day. Is there sufficient evidence to support a claim of different population means? We might expect that a solar system would provide more electrical energy on sunny days than on cloudy or rainy days. Can we conclude that sunny days result in greater amounts of electrical energy?
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Sunny Days
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Cloudy Days
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Rainy Days
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13.5
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12.7
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12.1
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13.0
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12.5
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12.2
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13.2
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12.6
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12.3
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13.9
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12.7
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11.9
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13.8
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13.0
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11.6
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14.0
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13.0
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12.2
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