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How Do Test Statistics for Two-Sample Tests Vary Depending on Whether

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How do test statistics for two-sample tests vary depending on whether the population standard deviations are known, and if not, whether they are assumed to be equal?


Definitions:

Positron Emission

is a process in nuclear physics and medical imaging where a positron is emitted from a radionuclide, used notably in Positron Emission Tomography (PET) scans to observe metabolic processes.

Transcranial Magnetic Stimulation

A non-invasive procedure that uses magnetic fields to stimulate nerve cells in the brain to treat depression and other conditions.

Deep Brain Stimulation

A neurosurgical procedure aimed at treating neurological and psychiatric conditions by implanting electrodes in specific areas of the brain to send electrical impulses.

Lesioning Techniques

Methods used in neuroscience to study the brain by intentionally damaging specific areas to observe behavioral effects.

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