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Sample Null Hypothesis Design Experiment Control Large Representative

Front How do you design an experiment?
Back
- control?
- large sample so that it's representative
- random sample so it's unbiased
- specify time frame

- calculate mean 

- why this stat test
- null hypothesis
- if x>|c|, difference/correlation is significant
- less than 5% probability that results are due to chance
- we reject the null hypothesis

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