A government environmental agency is interested in methods that will encourage energy conservation by households within the country.

They want to conduct an experiment in order to test whether the provision of in-house devices that provide an instantaneous indication of current household electricity consumption will lead to reductions in electricity consumption.

The sample design to investigate this research question is to track a sample of customers who volunteer to have the devices installed and then compare mean annual electricity consumption before and after the installation. The only problem with this proposed sample design is that the customers are volunteers.

Select one:

True

False