A standardized test has a scale that ranges from 3 to 45. A new type of review course for the test was developed by a training company. The accompanying table shows the scores for nine students before and after taking the review course. Complete parts (a) through (d) below. Click the icon to view the data table. a. Perform a hypothesis test using o = 0.05 to determine if the average test score is higher for the students after the review course when compared with before the course. Let u. be the population mean of matched-pair differences for the score before the course minus the score after the course. State the null and alternative hypotheses. Choose the correct answer below. O A. Ho: Hd = 0 OB. Ho: Hd 20 H1 : Hd # 0 H1: Ha 0 OD. Ho: Ha SO - X Hy : Ha S0 H1 : Ha >0 Test Scores OE. Ho: Ha # 0 OF. HO: Ha