Which set of ordered pairs represents a function?
{(2,9),(5,9),(1,−6),(−5,5)}
\{(6, 6), (6, 8), (-8, -7), (-3, -8)\}{(6,6),(6,8),(−8,−7),(−3,−8)}
\{(1, 8), (9, -3), (7, -4), (7, -6)\}{(1,8),(9,−3),(7,−4),(7,−6)}
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+79 +79 
+10 Свойство на две групи, експериментална и контролна, точките са разпределени както следва:
Експериментална- 18, 15, 16, 11, 14, 15, 16, 16, 20, 22, 17, 12, 11, 12, 18, 19, 20
Контролна- 26, 8, 11, 12, 25, 22, 13, 14, 21, 20, 15, 16, 17, 16,
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+239 +10 
+4 
+256
