An immunologist wants to compare two rabies vaccines. People who had previously received the vaccine were divided into two groups. The first group received a booster dose of the type I vaccine and the second group received a booster dose of the type II vaccine. Two weeks later the level of antibodies was measured. The average number of antibodies in each group appears in the following table:

Do these data indicate that there is a difference in the effectiveness of the two vaccines used for booster doses? Assume a normal distribution and equal population variances. (Select the output that best responds to the corresponding analysis)

Based on the findings of the test carried out, it is possible to conclude that .......

Grupo X I 27 5.5 II 24 3.5 2Two-Sample T-Test and CI Method Hi: mean of Sample 1 He mean of Sample 2 Difference: H1 - H= Equal variances are assumed for this analysis. Descriptive Statistics Sample N Mean StDev SE Mean Sample 1 27 5.50 3.00 0.58 Sample 2 24 3.50 2.00 0.41 Estimation for Difference Pooled 95% Cl for Difference StDev Difference 2.000 2.579 (0.546, 3.454) Test Null hypothesis Ho: H1 - H= = 0 Alternative hypothesis H1: 1 - H= = 0 T-Value DF P-Value 2.76 49 0.008Two-Sample T-Test and CI Method Hi: mean of Sample 1 He mean of Sample 2 Difference: H1 - H= Equal variances are assumed for this analysis. Descriptive Statistics Sample N Mean StDev SE Mean Sample 1 27 5.50 3.00 0.58 Sample 2 24 3.50 2.00 0.41 Estimation for Difference Pooled 95% Lower Bound Difference StDev for Difference 2.000 2.579 0.787 Test Null hypothesis Ho: H1 - H= = 0 Alternative hypothesis H1: 1 - > > 0 T-Value DF P-Value 2.76 49 0.004