**Frequency domain analysis** refers to analysis where a signal is studied with respect to frequency, rather than with respect to time. The data being studied is plotted with the frequency on the x axis and the amplitude on the y axis; this shows how the signal’s energy is distributed as a function of frequency.

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*Statistical concepts explained visually* - Includes many concepts such as sample size, hypothesis tests, or logistic regression, explained by Stephanie Glen, founder of StatisticsHowTo.

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