PPT Slide
Why do we need statistics???
When we conduct any type of research, we can make at least two major types of errors when we draw our conclusions:
I) we can claim to have found an important treatment effect when in reality there is no treatment effect.
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II) we can claim that no treatment effect exists when in reality there is an important treatment effect
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P-value: The probability that the difference we observed could be due to chance alone.
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Power: The probability that if there is a real difference, our experiment will find it.