The following table displays descriptive statistics on the participants involved in the study described above. Experimental Medication Placebo Characteristic (n=250) (n=250) Age, years: Mean (SD) 44.3 (1.4) 45.6 (3.1) % Males 55% 43% Education Level, years: Mean 13.1 (2.9) 14.2 (3.1) (SD) Annual Income, Dollars: $32,560 ($1,054) $34,470 ($998) Mean (SD) Body Mass Index, kg/m2: Mean 26.7 (4.0) 22.1 (6.4) (SD) SD is the standard deviation of the variable listed. Question Which of the following is the set of hypotheses for testing if there is a difference in mean age in participants assigned to the experimental versus the placebo groups? O a. Ho : #1 = 12 ; H1 : M1 / M2 O b. Ho : Ma = 0; H1 : Ha # 0 O c. Ho : P1 = p2 ; H1 : P1 # p2 O d. Ho : P = Po ; H1 : P # Po