The hypothesis will be: If the amount of caffeine increases, then the heart rate of children will decrease.
A hypothesis is known to be a kind of a proposed explanation that is said to be made as a phenomenon.
Note that an hypothesis can be scientific and as such will need scientific method to test it.
Therefore, The hypothesis will be: If the amount of caffeine increases, then the heart rate of children will decrease.
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Write a hypothesis that is your prediction about the relationship between the following independent variable (IV), and dependent variable (DV):
IV- amount of caffeine DV-heart rate of children
