Treatment Placebo A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the two samples are independent simple random samples selected from H \"1 \"2 normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.01 signicance level for both parts. '1 23:9 24'; x . . s 0.91 0.61 a. Test the claim that the two samples are from populations with the same mean. What are the null and alternative hypotheses? OA. Hoil11u2 H1=u1