Notes: The data in this graph are for households that used electricity.
The percentiles describe the distribution of household electricity consumption data; for example, 25% of households in units constructed before 1940 consumed less than 3,867 kWh and 75% consumed more than that amount.
Source: 1997 Residential Energy Consumption Survey.

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Figure 2. Mean Annual Electricity Consumption (and 95% confidence ranges) by Year Constructed, 1997
(thousand kilowatthours per household)

Notes: The data in this graph are for households that used electricity.
The standard error is a measure of sampling error and can be used to calculate a confidence range. For example, the estimate for electricity consumption in units constructed before 1940 is 7,781 kilowatthours (kWh) and the standard error is 202 kWh. The 95% confidence interval is calculated by multiplying 1.96 times the standard error, and the 95% confidence range is 7,384 kWh to 8,177 kWh.
Source: 1997 Residential Energy Consumption Survey.

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