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