A homeowner measures the voltage supplied to his home on 21 days of a given month, and the average (mean) value is 102 volts. Determine whether the given value is a statistic or a parameter and why
The given value, 102 volts, is a statistic.
A statistic is a numerical value that summarizes data collected from a sample, which is a subset of a population. In this case, the homeowner measured the voltage supplied to his home on 21 days, which is a sample of the larger population of days in the given month. The average voltage of 102 volts is a summary of this sample data and represents a statistic.