Validates the data normality, test power, outliers and generates the R syntax.

You may **copy the data** from Excel, Google sheets or any tool that separate data with **Tab** and **Line Feed**.

Copy **one block of 2 consecutive columns includes the header**, and paste below. Click to see example:

The tool will ignore empty cells or non-numeric cells

validation message

Hypotheses

H_{0}: σ_{1} ≥ = ≤ σ_{2}

H_{1}: σ_{1} < ≠ > σ_{2}

F statistic

F = | S_{1}^{2} |

S_{2}^{2} |

F distribution

Normal distribution - the F test for variances is very sensitive to the normality assumption. |

S_{1}, S_{2} -Sample standard deviations of group1 and group2. | |

n_{1}, n_{2} - Sample size of group1 and group2. |

The tool calculates the p-value, the F statistic and the test power.

The following R code should produce the same results: