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 rhean 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 .

if between two CV) Step 4. Calculate the test statistic: i. Calculate the standard error which corresponds to the denominator of the test statistic: (keep 8 decimal places) ii. Calculate the test statistic rounded to 2 decimal places for z or 3 decimal places for t: ? Y test statistic Step 5. Decision: Since the test statistic is Select an answer ~ the critical value (s), we Select an answer v | Ho at the 4% significance level