article describes a study of 55 young adults with pierced tongues. The researchers found receding gums, which can lead to tooth loss, in 24 of the participants. (a) Construct a 95% confidence interval for the proportion of young adults with pierced tongues who have receding gums. (Use Table 3 in Appendix A. Give the answer to three decimal places.)   2) The formula used to calculate a confidence interval for the mean of a normal population when n is small is the following. x ± (t critical value)  What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round your answers to two decimal places.)   90% confidence, n = 11

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ne article describes a study of 55 young adults with pierced tongues. The researchers found receding gums, which can lead to tooth loss, in 24 of the participants.

(a) Construct a 95% confidence interval for the proportion of young adults with pierced tongues who have receding gums. (Use Table 3 in Appendix A. Give the answer to three decimal places.)
 
2)
The formula used to calculate a confidence interval for the mean of a normal population when n is small is the following.
x ± (t critical value) 
What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round your answers to two decimal places.)
 
90% confidence, n = 11
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