Question

There are three brands of a certain product. A
sample of 120 items sold is examined and
found to be allocated among four groups A,
B, C and D and brands I, II, III as shown
below :
Group
Brand
A
B C D
I
0
4
8 15
II 5
8
13 6
III
18
19 11 13
Is there any significant difference in brand
preferences ?
​

Answer 1

Answer:

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