Which of the following statements is false? When you have data that violate the assumption of sphericity: The means are adjusted for any groups that are affected by the violation using estimates of sphericity. You can use multivariate test statistics (MANOVA) instead. The degrees of freedom are adjusted for any F-ratios affected by the violation using estimates of sphericity. The Greenhouse-Geisser or Huynh-Feldt correction should be applied.