An investigator wants to know the percentage of 15-17-year-olds who smoke Marijuana in a city. It is not feasible to survey every teenager in the city. How many adolescents should the investigator include in the survey to ensure that a 95% confidence interval estimate of the proportion of teenagers who smoke Marijuana in the city is within 5% of the true proportion? Hint: please refer to Chapter 8, especially Example 8.3, in the core text (Sullivan, 2012).
Please clearly state your justifications and reasonable assumptions to support your conclusion. Cite your sources, and if using an online resource, provide the link for reference.
Division of Human Development and Disabilities, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention. (August 15, 2012). Teenagers (15-17 years of age). Retrieved October 4, 2013, from http://samples.jbpub.com/9781449623944/23951_2003WB_Final.pdf
http://www.cdc.gov.cuhsl.creighton.edu/ncbddd/childdevelopment/positiveparenting/adolescence2.html (Links to an external site.)
Sullivan, L. M. (2012). Essentials of biostatistics in public health (2nd ed.). Sudbury, MA: Jones & Bartlett Learning.