Determine the best test of significance for this situation: Researchers would like to determine the influence of music on anxiety levels and physiologic parameters in women undergoing gynecologic surgery. 48 women were recruited to receive music intervention. Preoperative anxiety was measured using the State Trait Anxiety Inventory (STAI) while noninvasive instruments were used in measuring the patients' physiologic parameters (blood pressure, pulse, and respiration). What is the difference in the mean preoperative anxiety and physiological parameters before and after music intervention? Data of STAI and all physiologic parameters were normally distributed. Choose the correct test from the following choices. O Non-parametric k independent samples O Multiple regression O Non-parametric 2 independent samples O Paired t test