significance testing

in hypothesis testing, a set of procedures used to determine whether the differences between two groups or models are statistically significant (i.e., unlikely to arise solely from chance). In its most common form, significance testing is used to decide whether the null hypothesis of no effect should be rejected. A comparison of the probability statistic obtained from the test to the chosen significance level determines whether an observed effect may be due to chance variance and hence whether the null hypothesis is or is not likely to be correct. This approach may also be used to differentiate between two models that differ in terms of the number of parameters specified in them (as in multiple regression analysis).

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Psychology term of the day

November 22nd 2024

population variance

(symbol: σ²) the square of the population standard deviation. It is a measure reflecting the spread (dispersion) of scores in a complete population of interest (e.g., the test scores of all students at a school).