Use the first 100 reading scores in Appendix B in the Salkind text to calculate the difficulty index for a multiple choice item if the responses to that item are recorded in the table below. What is your interpretation of the result?

The Vores 1 w 41 1 Haku 31 s w M ET E 41 41 Appendix B* 40 > H 2 Sample Data Set 1 TH 1 1 ma 12 50 3 41 1 2 + . 21 11 11 41 19 19 41 1 21 . Item Alternative A * B C D Total High Group 14 4 6 3 27 Low Group 7 6 5 9 5 27 Total 21 10 11 12 54 The Vores 1 w 41 1 Haku 31 s w M ET E 41 41 Appendix B* 40 > H 2 Sample Data Set 1 TH 1 1 ma 12 50 3 41 1 2 + . 21 11 11 41 19 19 41 1 21 . Item Alternative A * B C D Total High Group 14 4 6 3 27 Low Group 7 6 5 9 5 27 Total 21 10 11 12 54