A student of one of the authors of this text lives in a home with a solar electric system. At the same time each day, she collected voltage readings (in volts) 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?

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Solar electric system voltage readings (volts) Cloudy days 12.7 12.5 12.6 12.7 13.0 13.0 Sunny days 13.5 13.0 13.2 13.9 13.8 14.0 Rainy days 12.1 12.2 12.3 11.9 11.6 12.2