P-Value
6 definitions

This definition has not yet been approved by a moderator.

A term in statistics. It helps show whether a difference found between groups that are being compared is due to chance. A small p-value usually means that the difference between groups is not due to chance alone, but is due to some other factor, such as a treatment one of the groups received. A large p-value usually means that the difference between groups is probably due to chance alone.

FK Reading Ease
67.3

FK Grade Level
High School
  • Flag
  • "P-value": value - in a statistical hypothesis test, the P value is the probability of observing a test statistic at least as extreme as the value actually observed, assuming that the null hypothesis is true. This probability is then compared to the pre-selected significance level of the test. If the P value is smaller than the significance level, the null hypothesis is rejected, and the test result is termed significant; the significance of a statistical test. P-values of less than 0.05 are generally considered to be an indicator that a statistical model is significant; a quantitative estimate of the probability that the observed difference between two groups could have happened by chance alone
    FK Reading Ease
    28.3

    FK Grade Level
    Graduate School
  • Flag
  • A statistics term. A measure of probability that a difference between groups during an experiment happened by chance. For example, a p-value of .01 (p = .01) means there is a 1 in 100 chance the result occurred by chance. The lower the p-value, the more likely it is that the difference between groups was caused by treatment.

    FK Reading Ease
    79.7

    FK Grade Level
    Elementary School
  • Flag
  • In scientific studies, a number representing the statistical probability that an outcome is due simply to chance alone rather than as a result of the intervention. Typically, if the p-value is less than or equal to 1 in 20 (i.e., ≤ 5 in 100, or p ≤ .05), researchers can conclude that the outcome of the study is not due to chance alone.

    FK Reading Ease
    75.2

    FK Grade Level
    Elementary School
  • Flag
  • The p-value is the probability that the observed value of the test statistic or a value that is more extreme in the direction of the alternative hypothesis, calculated when H0 is true, is obtained.

    FK Reading Ease
    29.8

    FK Grade Level
    Graduate School
  • Flag
  • The p-value is the probability that the observed value of the test statistic or a value that is more extreme in the direction of the alternative hypothesis, calculated when H0 is true, is obtained.

    FK Reading Ease
    29.8

    FK Grade Level
    Graduate School
  • Flag