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_____ detects magnetic fields generated by electrical currents in the brain.
Historical Data
Information or records relating to past events, conditions, or performances, used for analysis, comparison, or forecasting.
Sample
A subset of a population selected for measurement, observation, or questioning to provide statistical information about the population.
Population
The entire group of individuals or items that is the subject of a statistical analysis.
COUNT(range)
A function in Excel that returns the number of cells containing numbers within a specified range.
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