The T Test For Correlated Means Should Be Used When. It is divded into independent measures and repeated measures. The paired samples t-test can be used to determine if two means are.
For example you would select the t. Mar 22 2021 The Independent Samples t Test compares the means of two independent groups in order to determine whether there is statistical evidence that the associated population means are significantly different. The two-sample comparison test described in Example 2 of Two Sample t Test with Equal Variances can be turned into a correlation problem by combining the two samples into one random valuable x and setting the random variable y the dichotomous variable to 0 for elements in one sample and to 1 for elements in the other sample.
The correlated t-test is performed when the samples typically consist of matched pairs of similar units or when there are cases of repeated measures.
If you want to compare more than two groups or if you want to do multiple pairwise comparisons use an ANOVA test or a post-hoc test. Your variable of interest should be continuous be normally distributed and have a similar spread between your 2 groups. The only difference comes in how the standard error of the. T test formula is described in detail here and it can be easily computed using ttest R function.
