Matched Pairs involves participants being selected for one group only but part of each group are matched for some relevant factors eg) age, gender, height.
Kiecolt Glaser did a matched pairs experiment in 1995.
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four, well two pairs of angles (they're matched
The matched subject because the experiment involves pairs which halves the df.
If they are not matched pairs, it does not really matter. If the combined sample size is fixed (because of costs, say) then it is better to have a larger sample where more variability is expected.
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
It has 2 pairs.