Matched Pair vs non-pooled t test

[Pineapple]

I'm a little bit confused as to when we would do a matched pair test and when we do a non-pooled t-test? I know that in order for us to do a matched pair test one of the major criteria is that the sample sizes are needed to be the same, but the same can be said about non-pooled t-tests...Would someone be able to clarify this concept a little?

[jamesmartinn]

You use a matched-pair t-test if you're looking at 2 measurements within the same individual, group, condition, etc.

I.e, comparing before and after times of how long it takes a rat to run a maze after giving some kind of experimental treatment.

I'm not sure what you mean by "non-pooled" T test, but I think you might be getting at a Independent samples t-test. This is basically what it sounds like. You compare two different groups on some variable.

i.e, you have two groups of mice. One group is female, one group is male. You give some sort of experimental treatment then measure how long it takes them to run through the maze. You compare Males vs Females to see if they differ.