Treatment Placebo A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the Hy H2 two samples are independent simple random samples selected from normally distributed populations, and do not n 31 34 assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance X 2.37 2.61 level for both parts. S 0.97 0.66 a. Test the claim that the two samples are from populations with the same mean. What are the null and alternative hypotheses? OA. HO: Hy # H2 OB. HO: H1 = H2 Hy: Hy H2 O C. Ho: Hy