Park et al. (A-17) studied 29 male subjects with clinically confirmed cirrhosis. Among other variables, they measured whole blood manganese levels (MnB), plasma manganese (MnP), urinary manganese (MnU), and pallidal index (PI), a measure of signal intensity in T1 weighted magnetic resonance imaging (MRI). They found a correlation coefficient of .559, p < :01, between MnB and PI. However, there were no significant correlations between MnP and Pi or MnU and Pi (r ¼ :353, p > :05, r ¼ :252, p > :05, respectively).

For the studies described in Exercises 29 through 46, do the following:

(a) Perform a statistical analysis of the data (including hypothesis testing and confidence interval construction) that you think would yield useful information for the researchers.

(b) Construct graphs that you think would be helpful in illustrating the relationships among variables.

(c) Where you think appropriate, use techniques learned in other chapters, such as analysis of variance and hypothesis testing and interval estimation regarding means and proportions.

(d) Determine p values for each computed test statistic.

(e) State all assumptions that are necessary to validate your analysis.

(f) Describe the population(s) about which you think inferences based on your analysis would be applicable.

(g) If available, consult the cited reference and compare your analyses and results with those of the authors.