# P What does P stand for? The Free Dictionary The Umbrian alphabet had a two-stroke form that recalled the ancient Semitic, and Faliscan had a rounded form that resembled a modern P flipped right-to-left. Oscan lengthened the second small vertical stroke found in the Umbrian form, and the result was similar to the Greek Π. P-values are usually automatically calculated by the program you use to perform your statistical test. They can also be estimated https://www.bookstime.com/articles/what-does-mm-mean using p-value tables for the relevant test statistic. For most tests, the null hypothesis is that there is no relationship between your variables of interest or that there is no difference among groups. If you have two different results, one with a p-value of 0.04 and one with a p-value of 0.06, the result with a p-value of 0.04 will be considered more statistically significant than the p-value of 0.06.

A p-value calculation helps determine if the observed relationship could arise as a result of chance. The p-value approach to hypothesis testing uses the calculated probability to determine whether there is evidence to reject the null hypothesis. The null hypothesis, also known as the conjecture, is the initial claim about a population (or data-generating process).

## Use in writing systems

This is because the smaller your frame of reference, the greater the chance that you stumble across a statistically significant pattern completely by accident. The p value is a number, calculated from a statistical test, that describes how likely you are to have found a particular set of observations if the null hypothesis were true. An investor claims that their investment portfolio’s performance is equivalent to that of the Standard & Poor’s (S&P) 500 Index. The p-value only tells you how likely the data you have observed is to have occurred under the null hypothesis. P values are most often used by researchers to say whether a certain pattern they have measured is statistically significant. A common digraph in English is ⟨ph⟩, which represents the sound /f/, and can be used to transliterate ⟨φ⟩ phi in loanwords from Greek. In English orthography and most other European languages, ⟨p⟩ represents the sound /p/. If you want to cite this source, you can copy and paste the citation or click the “Cite this Scribbr article” button to automatically add the citation to our free Citation Generator. If you want to know more about statistics, methodology, or research bias, make sure to check out some of our other articles with explanations and examples.

## Reporting p values

P-value is often used to promote credibility for studies or reports by government agencies. Census Bureau stipulates that any analysis with a p-value greater than 0.10 must be accompanied by p&l basis a statement that the difference is not statistically different from zero. The Census Bureau also has standards in place stipulating which p-values are acceptable for various publications. It corresponds to the Semitic pe, perhaps deriving from an earlier sign for “mouth.” The Greeks renamed this form pi (Π). The Semitic Pê (mouth), as well as the Greek Π or π (Pi), and the Etruscan and Latin letters that developed from the former alphabet, all symbolized /p/, a voiceless bilabial plosive. When the p-value falls below the chosen alpha value, then we say the result of the test is statistically significant. If the test statistic is far from the mean of the null distribution, then the p-value will be small, showing that the test statistic is not likely to have occurred under the null hypothesis. P values are often interpreted as your risk of rejecting the null hypothesis of your test when the null hypothesis is actually true.

## What is a null hypothesis?

The p value, or probability value, tells you how likely it is that your data could have occurred under the null hypothesis. It does this by calculating the likelihood of your test statistic, which is the number calculated by a statistical test using your data. A p-value of 0.001 indicates that if the null hypothesis tested were indeed true, then there would be a one-in-1,000 chance of observing results at least as extreme.

This leads the observer to reject the null hypothesis because either a highly rare data result has been observed or the null hypothesis is incorrect. Although this does not provide an exact threshold as to when the investor should accept or reject the null hypothesis, it does have another very practical advantage. P-value hypothesis testing offers a direct way to compare the relative confidence that the investor can have when choosing among multiple different types of investments or portfolios relative to a benchmark such as the S&P 500.

## How Can You Use P-value to Compare Two Different Results of a Hypothesis Test?

The minuscule letter resembles the majuscule, the chief difference being that the loop is brought down to the level of the line of writing and the vertical stroke is extended below the line. The English initial p is slightly aspirated—that is, it is accompanied by a slight puff of breath—in contrast to the unaspirated p of French, for example. In English, as in French and German, the letter is used in combination with h in words of Greek origin to denote the unvoiced labiodental spirant expressed in other words by the letter f—e.g., philosophy, phonetics, and graphic.

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