D Question 23 2.5 pts A teacher proposes a course designed to increase reading speed. To evaluate the effectiveness of this course, the teacher tests students' reading speed before (BEF) and after (AFT) they take the course. The results are shown in the table below. n | BEF | AFT 1 | 109 | 105 2 | 111 | 199 3 | 122 149 4 | 147 | 145 5 | 157 | 103 6| 145 | 164 7 | 171 | 156 Words/Minute BEF ... mean = 137.43 and standard deviation = 23.82 Words/Minute AFT .. mean = 145.86 and standard deviation = 33.60 The difference in the reading speeds (BEF at" AFT) for this sample results in ... Sample average difference = -8.43 with standard deviation = 43.78 Choose the appropriate hypotheses to test the claim that the course is effective in terms of increasing reading speed. O Ho: mu = 0 versus Ha: mu not = 0 O Ho: mu = 0 versus Ha: mu > 0 O Ho: 137.43 - 145.86 = 0 versus Ha: 137.43 - 145.86 > 0 O Ho: mu = 0 versus Ha: mu