The provided CSV file must not contain any headers and the data should be in the second column.
| Variance | Standard Deviation | Skewness | Observations needed (per variation) |
|---|---|---|---|
Microsoft's rule of thumb 1 for the minimum number of independent and identically distributed observations needed for the mean to have a normal distribution is \(355 × 𝑠^2\) for each variant, where 𝑠 is the skewness coefficient of the distribution of the variable \(X\) defined as:
$$𝑠 = {{E[X-E(X)]^3}\over{[Var(X)]^{3/2}}}$$