Question: 8.12 Conserving energy. Example 8.6 describes an experiment to learn whether provid ing households with digital displays or charts will reduce their electricity consumption. An

8.12 Conserving energy. Example 8.6 describes an experiment to learn whether provid ing households with digital displays or charts will reduce their electricity consumption.

An executive of the electric company objects to including a control group. He says: "It would be simpler to just compare electricity use last year (before the display or chart was provided) with consumption in the same period this year. If households use less electric ity this year, the display or chart must be working." Explain clearly why this design is inferior to that in Example 8.6.

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