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Average

A synonym for “mean”: the sum of a set of values divided by the number of values. In colloquial language, an average is a single number taken as representative of a non-empty list of numbers. Different concepts are used in different contexts. Often...

Alternative Hypothesis

In statistical analysis, hypothesis testing plays a critical role in making data-driven decisions. The process typically involves testing two mutually exclusive hypotheses: the null hypothesis (H0) and the alternative hypothesis (H1). This distinction helps...

Alpha Risk

Alpha risk (α) is the risk of incorrectly deciding to reject the null hypothesis, HO. If the confidence interval is 95%, then the alpha risk is 5% or 0.05. For example, there is a 5% chance that a part has been determined defective when it actually is not. One has...

Aliasing

Aliasing represents one of the most fundamental challenges in digital signal processing, affecting everything from computer graphics to audio recording. At its core, aliasing occurs when a continuous signal gets sampled at a rate insufficient to capture its full...

Accuracy

In a set of measurements, accuracy is closeness of the measurements to a specific value, while precision is the closeness of the measurements to each other. Accuracy has two definitions: More commonly, it is a description of systematic...
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