Baseline characteristics: experiments and clinical trials with different treatment groups commonly include "baseline characteristics," which constitute information about the characteristics of the different treatment groups. in a study of four different weight loss programs, each program had 40 subjects. the means and standard deviations of the ages in each group are as follows: atkins ( = 47 years, s = 12 years); zone ( = 51 years, s = 9 years); weight watchers ( = 49 years; s = 10years); ornish ( = 49 years, s = 12 years). these statistics are listed with a p- value of 0.41. a. how many variables are used to categorize the sample data consisting of the ages of subjects? b. what specific method is used to find p-value .41? c. what does the p-value of .41 indicate about the baseline characteristics of age? d. what would a small p-value (such as .001) indicate about the ages and how would that affect the results of the study?