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Variable Effects Answer  Evaluate Questions Positives Negatives Sample

Front How do you answer Evaluate questions?
Back - Positives and Negatives

- sample too small / not representative 

- results may be different over larger time scale
- no control

- as x increases, y increases/decreases
- correlation does not mean causation
- named factor may have affected dependent variable
- choose 1 variable specific to experiment that should have been controlled

- range of effect? does data reach 0?
- there may be side effects
- effects in humans may be different

- significance
- standard deviation / error bars
- no statistical test has been performed

- what don't we know?

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