A study was done using a treatment group and a placebo group. The results are shown in Treatment Placebo the table. Assume that the two samples are independent simple random samples H2 selected from normally distributed populations, and do not assume that the population 26 36 standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance X 2.34 2.69 level for both parts. S 0.57 0.89 . . . a. lest we vialliI tial we two sallipies are IT On populations will We SamTie meall. What are the null and alternative hypotheses? O A. HO: My H2 The test statistic, t, is (Round to two decimal places as needed.)