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The average number of cavities that thirty-year-old Americans have had in their lifetimes is 9. Do twenty-year-olds have more cavities? The data show the results of a survey of 12 twenty-year-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal.

The average number of cavities that thirtyyearold Americans have had in their lifetimes is 9 Do twentyyearolds have more cavities The data show the results of a class=
The average number of cavities that thirtyyearold Americans have had in their lifetimes is 9 Do twentyyearolds have more cavities The data show the results of a class=

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