2. A drug company is comparing the results of three medications on the severity of bacillary dysentery in 7'5 Peace Corps volunteers returning to the US {N e 75}. Below are the averages for these three groups. RememberI you'll solve this by using the incomplete ANOVA table. Placebo: xbarl = 16.74. n1 = 25 Ci profloxacin: xbarz = 13.64, n; = 25 Ooxacin: xbarg = 13.48, r13 = 25 a. State the null and alternative hypotheses. b. Conduct an ANOVA, showing all your work for each step. by completing the ANOVA table below. You need to show both the work for the answers you will present in the table and then also present the completed table itself. An Ftable with blanks E Sum of df H F Squares square statistic E 202.63 U W D Total 715.07 | > ((57) =- 10.1-11.6 -1.5 -1.5 -1.5 = -1.77 V7.162 (0.10) 0.846 7-462 0 10.716 . For the t-statistic of -1.77, we FAIL to reject the null hypothesis because it is less extreme than our critical value of -2.00. Because we fail the null hypothesis, we conclude symptoms are the same for the CBT and the SSRI therapy groups. CBT and Combination > ((57) = 10.1-84- 1.7 = 2.01 0.846 0.846CBT and Combination > *(57) = 10.1-84 2.01 0.846 0.846 . For the t-statistic of 2.01, we REJECT the null hypothesis because the t-statistic is more extreme than our critical value of 2.00. Those in the Combination therapy group have less severe PTSD symptoms compared to the CBT group. SSRI and Combination > (57) = 11.6-8.4 32 = 3.78 0.846 0.846 . For the t-statistic of 3.78, we REJECT the null hypothesis because the t-statistic is more extreme than our critical value of 2.00. Those in the Combination therapy group have less severe PTSD symptoms compared to the SSRI group. After conducting our t-test three times, we can conclude Combination Therapy is better than either SSRI or CBT therapy alone