1hr32mins Two groups of patients with breast cancer are treated with two different drugs to reduce pain. A random sample of 54 patients who are treated using Fulvestrant drug has a mean of 11.4 pain-free months. The population standard deviation for this treatment group is 2 months. Another random sample of 64 patients who are treated using Letrozole drug has a mean of 9.3 pain-free months. The population standard deviation for this treatment group is 1.2 months. At the 4% significance level, test a pharmaceutical representative's claim that the population mean of the pain-free period using Fulvestrant is longer than that of the Letrozole treatment. Note: If t-test, then unequal variances are assumed. Let: My: the population mean of the pain-free period using Fulvestrant M2: the population mean of the pain-free period using Letrozole Follow the steps below. Step 1. State the null and alternative hypotheses by selecting the appropriate symbol: Ho: H1 2 12 H1: /1 3 12 Step 2. Find the critical value (s)