A market researcherbelieves that in a certain population the proportion of persons preferring brands A, B, C, and D of tooth paste are 0.20, 0.70, 0.02 and 0.08 respectively. A simple random sample of 600 persons drawn from the population shows the following preference. Brand A B D Number of person 190 344 44 22 Do these data provide sufficient evidence to reject the researcher's belief at a = 0.01

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