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Standard deviation is a computed measure of how much scores vary around the mean.

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The determinism approach assumes that human are free to choose their behaviour, that they are essentially self-determining.

A neurotransmitter is a junction where information is transmitted from one neuron to another.

In quantity studies the same subjects are investigated over a long period of time.

Reliability means whether it measures what it is supposed to measure. Validity means how consistently it measures.

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