See: http://stattrek.com/AP-Statistics-4/Paired-Means.aspx?Tutorial=Stat Usually referred to as the "match paired t-test." It is comparing the mean of two samples, but the data in first sample is paired with the data in the second sample, for a more logical comparison.
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In situations where there is a logical tie between the data we use a matched pairs experiment • In this experiment we match an observation in one sample with an observation in another • The match is created due to the logical tie they share. • Ex. Studying salaries of marketing and finance majors with similar GPA's - the logical connection is similar GPS's, the data we are pairing is salaries.
Assuming the 36 numbers are all different, there are 36*35/2 = 630 pairs.
Ordered pairs are used for many things. Anytime you graph a point on a cartesian coordinate system, you have an ordered pair. In fact, all of R^2 is made up of ordered pairs. When you put a value in a function and get one out, you have an ordered pair
1x20 2x10 5x4