A consumer advocacy group surveys households to estimate the mean monthly electricity usage and reports an estimated mean of 900 kWh with a margin of error of 50 kWh. Which of the following is the most appropriate conclusion?
It is plausible that the average usage for all households is between 850 and 950 kWh.
All households use between 850 and 950 kWh.
Most households use exactly 900 kWh.
No household uses less than 850 kWh.
