How do you know what statistical test to use?

Selection of appropriate statistical method depends on the following three things: Aim and objective of the study, Type and distribution of the data used, and Nature of the observations (paired/unpaired).

How do you tell if there is a significant difference between three groups?

If you are using categorical data you can use the Kruskal-Wallis test (the non-parametric equivalent of the one-way ANOVA) to determine group differences. If the test shows there are differences between the 3 groups. You can use the Mann-Whitney test to do pairwise comparisons as a post hoc or follow up analysis.

What are the statistical methods used in research?

In statistics, we distinguish the most commonly applied statistical methods among the existing ones: descriptive statistics; design of experiments; sampling; hypothesis testing; regression, correlation and factor analysis; time series analysis; statistically specified tolerances; analysis of the measurements accuracy; …

What statistical method can be used to compare two group means contributed by two independent groups?

The one-way ANOVA compares the means of the groups you are interested in and determines whether any of those means are statistically different from each other. A one-way ANOVA has one independent variable while a two-way ANOVA has two independent variables.

Which statistical test is used to compare group means in a sample?

t-test
The compare means t-test is used to compare the mean of a variable in one group to the mean of the same variable in one, or more, other groups. The null hypothesis for the difference between the groups in the population is set to zero. We test this hypothesis using sample data.

What statistical test should I use to compare three groups?

One of the more common statistical tests for three or more data sets is the Analysis of Variance, or ANOVA. To use this test, the data must meet certain criteria. If these assumptions are met, the ANOVA test can be used to analyze the variance of a single dependent variable across three or more samples or data sets.

What statistical test would you use to determine whether or not there is a difference between two groups in a specific variable?

A t-test is a type of inferential statistic used to determine if there is a significant difference between the means of two groups, which may be related in certain features. The t-test is one of many tests used for the purpose of hypothesis testing in statistics.