Population Proportion Symbol p

Population Proportion Symbol commonly uses the lowercase letter p. On this page the character is U+0070 LATIN SMALL LETTER P, assigned specifically to a population proportion or probability parameter. Because p is an ordinary letter with many possible meanings, the surrounding statistical statement must define the parameter. Examples include “Population proportion: p”, “p = 0.42”, “H₀: p = 0.5”, and “0 ≤ p ≤ 1”. These forms place p inside a model, hypothesis, or allowed range. A sample proportion is commonly written p̂, so replacing p with p̂ changes a population parameter into an estimate from sample data. Use consistent case and typography. Capital P may represent a different probability notation, while π is an alternative convention in some books. If a report contains several of these forms, include a notation key and state whether the value is a parameter or a statistic. Do not rely on color or font style alone to distinguish them. The copyable character is simply p, but its statistical role comes from the definition, equation, and nearby labels. For screen readers or tables without explanatory prose, use a label such as “population proportion p.” Population Proportion Symbol is therefore a notation reference, not a claim that every lowercase p in a document has this statistical meaning. When the page is used in a worksheet or report, review every p against the notation key. A hypothesis such as H₀: p = 0.5 refers to the defined population parameter, while a computed sample value may be p̂. Include the range or model assumptions where relevant, and make sure automated formatting does not turn p into capital P or remove the hat from a sample statistic.