Equality of the Variances

Equality of the Variances of Two Normally Distributed Populations, where both Samples are Random and Independent

Hypothesis
H0: σ1² = σ2² , or σ1² ≥ σ2² , or σ1² ≤ σ2²
H1: σ1² ≠σ2² , or σ1² < σ2² , or σ1² > σ2²

Test statistic χ²= s1²/s2²

Use F-test

Critical value comes from F table.
{Look up df1=n1 - 1, df2 = n2 -1, p=significance}.,
F-distritubiton - right skewed, truncated at zero on left hand side,2 separate defree of freedom