1 POINT We are doing a two-mean pooled t-test. We have two samples with sizes n = 23 and n = 15. The population standard deviations are unknown but assumed to be equal, so we find the sample standard deviations and use them to calculate a pooled standard deviation, Sp. For sample 1: s = 15 and x = 45 For sample 2: $2 = 15.6 and x2 = 41 What are the test statistic (/) and the degrees of freedom to perform this test? Select the correct answer below: If Sp = 1 = 15.236, then 23-15 (15.236) df = 38 5+ 2.43 41 If sp = 15.236, then 45-41 t= (15.236) 1.22 df = 38 If sp15.236, then t = O 45-41 (15.236) + df = 36 0.79 T If Sp = 15.236, then 45-41 t= 0.79 (15.236) +15 df = 38 If Sp = 15.236, then t = 23-15 (15.236) df = 36 2.43 If Sp t = 15.236, then 23-15 1.58 (15.236) df = 36 + V 15