An ANOVA comparing the waiting times for four different emergency rooms shows the following
Comparison of the four mean waiting times. 
Which two pairs of means are significantly different?
A) ER1 is significantly different from ER2.
B) ER1 is significantly different from ER3.
C) ER1 is significantly different from ER4.
D) ER1 is significantly different from ER2; ER4 is significantly different from ER2.
E) ER2 is significantly different from ER3; ER4 is significantly different from ER3.
Correct Answer:
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