22 lines
465 B
Markdown
22 lines
465 B
Markdown
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### Null hyposthesis
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### Confidence interval
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Interval which is expected to contain the parameter
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$$
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CI = \bar{x} \pm z \frac{s}{\sqrt{n}}
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$$
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Where $z\frac{s}{\sqrt{n}}$ is the variation in our estimate.
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### T-Test
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Used to determine if there is a significant difference between the means of two groups.
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We have to assume:
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- Data follows a normal distribution
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- each observation is independent
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$$
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t = \frac{\text{mean} - \text{theoretical value}}{s\sqrt{n}}
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$$
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