无效假设是

A、μ[img=~/QImg/2013-10-14-11-38-02/image025.gif]=μ[img=~/QImg/2013-10-14-11-38-02/image026.gif]
B、μ[img=~/QImg/2013-10-14-11-38-02/image025.gif]≠μ[img=~/QImg/2013-10-14-11-38-02/image026.gif]
C、π[img=~/QImg/2013-10-14-11-38-02/image025.gif]=π[img=~/QImg/2013-10-14-11-38-02/image026.gif]
D、π[img=~/QImg/2013-10-14-11-38-02/image025.gif]≠π[img=~/QImg/2013-10-14-11-38-02/image026.gif]
E、π[img=~/QImg/2013-10-14-11-38-02/image025.gif]>π[img=~/QImg/2013-10-14-11-38-02/image026.gif]