Texts: Reichman et al. (A-50) conducted a study with the purpose of demonstrating that negative symptoms are prominent in patients with Alzheimer's disease and are distinct from depression. The following are scores made on the Scale for the Assessment of Negative Symptoms in Alzheimer's Disease by patients with Alzheimer's disease (PT) and normal elderly, cognitively intact, comparison subjects (C).
(a) Perform a statistical analysis of the data (including hypothesis testing and confidence interval construction) that would yield useful information for the researchers.
(b) State all assumptions that are necessary to validate the analysis.
(c) Find p-values for all computed test statistics.
(d) Describe the population(s) about which the inferences based on your analysis would be applicable. Please show any Excel functions or R code used.