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(2) A study looked at the number of additional cavities in children before and after public water fluoridation projects in 54 North American cities ....
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(2) A study looked at the number of additional cavities in children before and after public water fluoridation projects in 54 North American cities.

This appropriate test of hypothesis to use is:a. independent one-sample t-test of the meansb. independent two-sample t-test of the meansc. one-sample χ2test of the varianced. two-sample χ2test of the variancese. paired t-test of the mean differencef. none of the above
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