The t-test for dependent samples compares the means of two related groups in order to determine if there is significant difference among them. It is also called by the following names: dependent samples t-test, matched-pairs t test, repeated measures t test, t test for dependent means, t test for related samples, or paired t-test.

An example below shows how t-test for dependent samples is used in comparing the sedimentation rates of a river during a sunny day and rainy day. Take note that the observed sedimentation rates were taken on the same river, thus, the two groups of samples (sunny day and rainy day) are considered as dependent/correlated samples.

Credits:

http://www.statisticslectures.com/topics/dependentsamplest/

https://statistics.laerd.com/statistical-guides/dependent-t-test-statistical-guide.php

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