307 Diamonds Were Sampled and Randomly Sorted into Three Groups $\mu \mathrm { HRD } \& \mu _ { \mathrm { GIA } }$

307 diamonds were sampled and randomly sorted into three groups of diamonds. These diamonds were randomly assigned to one of the three organizations, or groups (HRD, GIA, or IGI) , that
Certify the appraisal of diamonds. A study was conducted to determine if the average size of
Diamonds reported by these three certification groups differ. A completely randomized design was
Used and the Bonferroni multiple comparison results are shown below. Bonferroni All-Pairwise Comparisons Test of CARAT by CERT


Give the population mean(s) which are in the statistically largest group.

A) $\mu \mathrm { HRD } \& \mu _ { \mathrm { GIA } }$
B) $\mu \mathrm { HRD }$
C) $\mu _ { \mathrm { GIA } }$
D) $\mu \mathrm { IGI }$