An exercise specialist wishes to check the validity of the sit-ups test as a measure of abdominal strength. She compares the sit-ups test with a criterion test, electromyographic (EMG) readings of the activity of the abdominal muscles. Both tests are used in a criterion-referenced framework. On the EMG test, a cut-off score of 27 or above reflects substantial activity in the abdominal muscles. The exercise specialist decides to try using a cut-off score of 55 or above on the sit-ups test to check the criterion-referenced test validity. She obtained the test scores presented below. Subject Sit-Ups Test* EMG Test"* 73 32 42 34 51 34 63 25 59 27 39 34 57 33 70 36 65 29 69 28 46 34 51 21 52 30 56 31 64 27 cut-off score = 55 sit-ups * * cut-off score = 27 units of muscle activity Your tasks: 1. Develop a contingency table for these scores 2. Calculate C, the validity coefficient 3. Determine if the sit-ups test valid 4. Submit your C-coefficient and evaluation (valid or not valid). Your answers will be reviewed and scored by the instructor after you submit. C- coefficient Evaluation