Tongue piercing may speed tooth loss

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Reference no: EM131820762

"Tongue Piercing May Speed Tooth Loss, Researchers Say" is the headline of an article that appeared in the San Luis Obispo Tribune (June 5, 2002). The article describes a study of 52 young adults with pierced tongues. The researchers found receding gums, which can lead to tooth loss, in 18 of the participants.

a. Construct a 95% confidence interval for the proportion of young adults with pierced tongues who have receding gums.

b. What assumptions must be made for use of the z confidence interval to be appropriate?

Reference no: EM131820762

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