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. Construct a 95% con- fidence interval for the proportion of young adults with pierced tongues who have receding gums. What assumptions must be made for use of the z confidence interval to be appropriate?

1 STAT 145 Introduction to Statistics 1 Chapter 3 Numerically Summarizing Data Terms ormulas 3.1 Measures of Central Tendency Objectives: Understand Mean, Median, and Mode Arithmetic Mean: The sum of ALL values or the number of observations Median: Mid value of the data when it is in ascending order Mode: M ost frequent occurrence in the data set Range: Difference between the largest and smallest data values EX.