Analysis of Variance (ANOVA)

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Definition of 'Analysis of Variance (ANOVA)'

Analysis of variance (ANOVA) is a statistical method used to compare the means of two or more groups. It is used to determine whether the differences between the means of the groups are statistically significant, meaning that they are unlikely to have occurred by chance.

ANOVA is a powerful tool that can be used to test a wide variety of hypotheses. For example, it can be used to test whether a new drug is effective in treating a disease, or whether a new marketing campaign is effective in increasing sales.

ANOVA is a parametric test, which means that it makes certain assumptions about the data. These assumptions include the following:

* The data is normally distributed.
* The variances of the groups are equal.
* The data is independent.

If these assumptions are not met, then the results of ANOVA may not be valid.

The steps involved in performing ANOVA are as follows:

1. The first step is to identify the dependent and independent variables. The dependent variable is the variable that you are trying to measure, such as the weight of a patient or the sales of a product. The independent variable is the variable that you are using to divide the data into groups, such as the type of drug or the type of marketing campaign.
2. The second step is to collect the data. The data should be collected from a random sample of the population.
3. The third step is to check the assumptions of ANOVA. This can be done using a number of statistical tests.
4. The fourth step is to perform the ANOVA test. This can be done using a number of statistical software packages.
5. The fifth step is to interpret the results of the ANOVA test. The results of the ANOVA test will tell you whether the differences between the means of the groups are statistically significant.

ANOVA is a powerful tool that can be used to test a wide variety of hypotheses. However, it is important to remember that ANOVA makes certain assumptions about the data. If these assumptions are not met, then the results of ANOVA may not be valid.

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