A multiple comparison procedure for comparing four Ed treatment means produced the confidence intervals shown here. Rank the means from smallest to largest. Which means are significantly different?
(µ1 - µ2): (2, 15)
(µ1 - µ3): (4, 7)
(µ1 - µ4): (-10, 3)
(µ1 - µ3): (-5, ll)
(µ1 - µ4): (-12, -6)
(µ1 - µ4): ("8, -5)