Function box_test 

pub fn box_test(
    class_a: &[f64],
    class_b: &[f64],
    low_percentile: f64,
    confidence: f64,
) -> BoxTestResult

Box test per the Crosby-Wallach methodology: compares the low percentile (p10 by default) of two response-time samples; the confidence interval is built via bootstrap resampling.