Exercise Table 5.3 gives the survival time in weeks of 30 brain tumorpatients receiving four different treatments.Are the four treatmentsequally effective?
Exercise Table 5.3
1
2
3
4
5
7
15
9
14
20
12
31
20+
27
39
25
23
30
47
30+
32+
55+
50+
67+
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