To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
?
Treatment
ObservationsA
20
30
25
33
B
22
26
20
28
C
40
30
28
22
?
The null hypothesis for this ANOVA problem is
A. ?1 = ?2.
B. ?1 = ?2 = ?3.
C. ?1 = ?2 = ?3 = ?4.
D. ?1 = ?2 = ... = ?12.
Answer: B
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