A longitudinal study of 14 students was done with a test before and after a treatment was applied. The treatment is designed to reduce the level of a specific chemical in the body. Using a 0.05 level of significance was the treatment effective? Results of the two samples are shown below. Student Before After Lucy 61 63 Victor 57 65 Irene 54 76 Louis 58 68 Maria 65 70 Rose 63 80 Connie 55 78 Sonia 56 80 Ankita 60 78 Paula 61 79 Mila 60 82 Sam 54 96 Fernanda 52 92 Horace 51 88