Which is a quantitative method of data collection?
grouping students based on their average marks in the previous year's final exam
collecting information about unknown women scientists in the united states
collecting information about food traditions in the united states

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.