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The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population, the mean number of cavities at a 6 month check up is 1.73. a. Is this a one or two tailed test
This question was answered on: Oct 24, 2017
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