Statistical Symbols And Definitions Matching Assignment

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For a given test, the only way to reduce both error rates is to increase the sample size, and this may not be feasible.

A test statistic is robust if the Type I error rate is controlled.

Tabularised relations between truth/falseness of the null hypothesis and outcomes of the test:): "Adding water does not make toothpaste more effective in fighting cavities." This null hypothesis is tested against experimental data with a view to nullifying it with evidence to the contrary.

A type I error occurs when detecting an effect (adding water to toothpaste protects against cavities) that is not present.

Thus a type I error is a false positive, and a type II error is a false negative.

When comparing two means, concluding the means were different when in reality they were not different is a type I error; concluding the means were not different when in reality they were different is a type II error.

In statistical hypothesis testing a type I error is the rejection of a true null hypothesis (also known as a "false positive" finding or conclusion), while a type II error is the non-rejection of a false null hypothesis (also known as a "false negative" finding or conclusion).

In statistics, a null hypothesis is a statement that one seeks to nullify (that is, to conclude is incorrect) with evidence to the contrary.

Due to the statistical nature of a test, the result is never, except in very rare cases, free of error.

Two types of error are distinguished: type I error and type II error.


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