In a market survey conducted to examine whether the choice of a brand is related to the income levels of the consumers, a random sample of 400 consumers reveal the following:
Income level Brand 1 Brand 2 Brand 3 Total
per month
20000 93 72 75 240
20000-50000 50 35 37 122
>50000 12 15 11 38
Total 155 122 123 400
Test the association between income level and brand preference at 5% significant level.
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