Case Study 5

The readings for this week focus on various types of nonparametric tests. In this discussion we will apply those concepts to the analysis of a case study. Read the “Diet and Health” case study presented in Chapter 20 of the Online Statistics Education text.

In the body of your posting, include an overview of the following based on the research questions, “What is the relationship between diet and various measures of health and disease?”

• Hypotheses: List the statistical notation and written explanations for the null and alternative hypotheses for the study.
• Variables: Describe the independent and dependent variables, their levels, operational definitions, and characteristics (e.g., scale of measurement).
• Data Analysis: The table of frequencies in the case study have been presented to you, along with the following: χ2 = 16.55, p = .001. Summarize the specific type of statistical test conducted, the results obtained, and conclusions regarding the hypotheses (e.g, can we reject at the .05 or .01 level?). Be sure to describe why this specific nonparametric test was selected.
• Critique: Critique the results of the study, paying specific attention to the appropriateness of the analyses conducted, any biases or assumptions that were made, practical significance of the results, and recommendations for improving upon the study (methods or analyses).