Question

10.8 Health risks to beachgoers. According to a University of Florida veterinary researcher, the longer a beachgoer sits in wet sand or stays in the water, the higher the risk of gastroenteritis (University of Florida News, Jan. 29, 2008). The result is based on a study of more than 1,000 adults conducted at three popular Florida beaches. The adults were divided into three groups: (1) beachgoers who were recently exposed to wet sand and water for at least two consecutive hours, (2) beachgoers who were not recently exposed to wet sand and water, and (3) people who had not recently visited a beach. Suppose the researcher wants to compare the mean levels of intestinal bacteria for the three groups. For this study, identify each of the following: a. experimental unit b. response variable C. factor d. factor levels

1. Would you consider this a designed study or observational study? Why?

Answer 1

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Page No! 2 Backenia" is the response variable o factor: variable whose effect on the response is of Interest to the experimenter. These factor | are either quantitative or qualitative, depending on what other they are measured ono numerical or non- numerical Scale respectively in the problem the researcher wants to study the effect of the duration an adult spends time in a beach sitting in cet Saud or staying in the waters to the level of intestine bactenia that causes gastroenteritis .. 1. Thus the factor that the ve Searches is studying is the duration a beachgoen spends in well sand or water

PageNo3 @ factor levels: The values of the factor utilized in the experiment. Qualitative factors csill have won numerical levels and quantitative * Beachgoer who were recently exposed to wet Sand Gwater for at least two hours * Beachgoer who were not recently exposed to wet Sand qwater * people who had not recently visited a beach