13. The following table describes a randomized trial comparing an exPerimental medication to a placebo for treatment of reux. 2,. Experimental Treatment Placebo Patient Characteristics (:2 = 100) (n = 100) 12 Mean (SD) age (years) _ 52 (5.6) 54 (5.2) 0.0090 Gender: % Female 63% 58% 0.4363 Mean (SD) educational level (years) 13 (3.2) 10 (2.1) 0.0453 Mean (SD) annual income ($0005) $42 ($4.5) $39 ($5.6) 0.0918 Clinical characteristics Mean (SD) number of episodes 8 (3.2) -' 6 (2.9) - 0.0001 per week Severity of symptoms: % Minimal 21% 15% 0.0021 % Moderate 45% 2.1% % Severe ' 24% 64% . ___________.___...---'\"\"" a. Are there any statistically signicant differences between the patients assigned to the experimental treatment and placebo? Justify your answer briey. b. Consider the comparison of treatments with respect to patient age. Run the appropriate test using the data provided