2. Crohn's disease is a chronic inflammatory disease. A double-blind completely randomized experiment of 71 persons who were resistant to or intolerant to the standard therapy was conducted where 37 received cyclosporine and 34 a placebo: Population Better No Total Cyclosporine 22 15 37 Placebo 1 1 23 34 a. Explain what double-blind means in context of this problem. b. Find a 90 percent confidence interval for the proportions of those who got better with cyclosporine. C. Interpret the confidence level