Examlex
Dr. Nguyen is studying how amount of sleep influences mood for kindergarteners. A sample of 100 children is selected. Fifty children are allowed to sleep for 11 hours each night. The other 50 children are awoken after 8 hours. After three nights, Dr. Nguyen records the mood for each child and compares the two groups of scores. In this example, how many levels are there for the independent variable?
Hydrogen
The lightest and most abundant chemical element in the universe, consisting of just one proton and often one electron.
Potassium Hydroxide
A strong base used in industry and research that is highly reactive with acids and capable of causing severe burns.
Base
In chemistry, a base is a substance that can accept protons (H+) from acids or donate a pair of valence electrons to form a bond, and it often has a high pH when dissolved in water.
Dissociates
Refers to the process by which molecules or ionic compounds split into smaller particles, often ions, in solution.
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