A group of students is investigating how the addition of salt impacts the floatation of an egg in water. Four identical cups were taken for the experiment. The data of the experiment are shown.
Experimental Record
Cup
Amount of Water (mL)
Amount of Salt (g)
Level of Egg above Water
1
450
0
Sinks to bottom
2
450
68
2 cm
3
450
136
3 cm
4
450
272
4 cm
Which cup acts as a control group?
1
2
3
4
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