Dr. Matchbox is interested in examining if completing lesson homework assignments will result in better test performance for his human sexuality class so he decided to compare the unit exam of 15 students that did not complete their homework assignments to 22 students that did complete their homework assignments. Dr. Matchbox's hypothesis about the influence of homework completion on test performance is best described as a O directional research hypothesis. O nondirectional research hypothesis. O directional null hypthesis O nondirectional null hypothesis.