Two ways of evaluating item discriminability are presented in the text: (1) the extreme groups method, the point biserial method. The exercises in this section ask you to calculate the item discriminability lev discrimination index, for the first five items on the University Aptitude Test (UAT). The extreme group method identifies the discrimination index for each item by comparing examinees performed well on the test (e.g, the top third) to those who did poorly on the test (e.g., the bottom thi The difference between the proportion of "top" examinees and the proportion of "bottom" examinees answered the item correctly is the discrimination index for that particular item. Below is a fabricated data set of 15 scores on a hypothetical test called the University Aptitude Test (U The UAT is a verbal analogies test consisting of 18 items. Use the table below to answer the related qu 7-9. Examinee Greg Allison Janine Corey Michelle Thomas Randall Tina LeeAnn David Marcia Lance Keisha Blair Joe Item 1 1 1 1 1 0 0 1 0 1 0 0 1 1 0 0 Item 2 1 1 1 1 0 1 1 0 1 1 0 1 1 1 0 Item 3 1 1 1 0 1 1 1 1 1 1 0 1 1 1 1 Item 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Item 5 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 Total: 16 7 10 11 3 11 14 10 1 11 4 9 15 11 6 ing item discriminability are presented in the text: (1) the extreme groups method, and (2) thod. The exercises in this section ask you to calculate the item discriminability level, or ex, for the first five items on the University Aptitude Test (UAT). method identifies the discrimination index for each item by comparing examinees who he test (e.g., the top third) to those who did poorly on the test (e.g., the bottom third). een the proportion of "top" examinees and the proportion of "bottom" examinees who correctly is the discrimination index for that particular item. data set of 15 scores on a hypothetical test called the University Aptitude Test (UAT). analogies test consisting of 18 items. Use the table below to answer the related questions Item 1 1 1 1 1 0 0 1 0 1 0 0 1 1 0 0 Item 2 1 1 1 1 0 1 1 0 1 1 0 1 1 1 o Item 3 1 1 1 0 1 1 1 1 1 1 0 1 1 1 1 Item 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Item 5 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 Total Score 16 7 10 17 3 11 14 10 13 12 4 9 15 12 6 Thomas 0 1 1 1 0 11 Randall 1 1 1 1 0 14 Tina 0 0 1 1 0 10 LeeAnn 1 1 1 1 13 0 0 David 1 1 1 11 0 Marcia 0 0 0 1 0 Lance 1 1 1 1 9 0 Keisha 1 1 1 1 0 15 Blair 0 1 1 12 1 0 Joe 0 6 0 1 1 0 7. Find the discrimination indexes for the first five items of the UAT by using the extreme group metho this exercise, you will identify the top-scoring third of examinees (or the top 5, since there are 15 exan and the lowest-scoring third of examinees (l.e., the bottom 5). Express your answers as whole number Examinees in the top third of the group Examinees in the bottom third of the group Name Score Name Score Corey 17 Michelle 3 1 1 1 U 11 OC U 1 Oo 1 1 1 0 14 0 1 1 0. 10 1 1 1 1 0 13 1 1 1 0 12 0 0 1 0 4 1 1 1 1 0 9 1 1 1 1 0 15 0 1 1 1 0 12 0 0 1 1 0 6 ation indexes for the first five items of the UAT by using the extreme group method. In ll identify the top-scoring third of examinees (or the top 5, since there are 15 examinees) ing third of examinees (i.e., the bottom 5). Express your answers as whole numbers. op third of the group Examinees in the bottom third of the group Score Name Score 17 Michelle 3 8. Calculate the discrimination index for item 1-5 and fill in your results in the table below. You will first need to calculate Pt and Po Be sure to refer to Box 6.1 on text p. 176 for step-by-step directions on how to calculate discrimination indexes. Enter your answer with a decimal point and two significant digits (e.g., .00) Discrimination Index Item number (d; = Pr - Pb) 1 2 3 5 9. Based on the findings of the extreme group method, evaluate the extent to which UAT items 1-5 discriminate well (again, be sure to read through all of Box 6.1 on text p. 176). Item 1: Select Item 2: Select Item 3: Select Item 4: Select Item 5: Select Two ways of evaluating item discriminability are presented in the text: (1) the extreme groups method, the point biserial method. The exercises in this section ask you to calculate the item discriminability lev discrimination index, for the first five items on the University Aptitude Test (UAT). The extreme group method identifies the discrimination index for each item by comparing examinees performed well on the test (e.g, the top third) to those who did poorly on the test (e.g., the bottom thi The difference between the proportion of "top" examinees and the proportion of "bottom" examinees answered the item correctly is the discrimination index for that particular item. Below is a fabricated data set of 15 scores on a hypothetical test called the University Aptitude Test (U The UAT is a verbal analogies test consisting of 18 items. Use the table below to answer the related qu 7-9. Examinee Greg Allison Janine Corey Michelle Thomas Randall Tina LeeAnn David Marcia Lance Keisha Blair Joe Item 1 1 1 1 1 0 0 1 0 1 0 0 1 1 0 0 Item 2 1 1 1 1 0 1 1 0 1 1 0 1 1 1 0 Item 3 1 1 1 0 1 1 1 1 1 1 0 1 1 1 1 Item 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Item 5 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 Total: 16 7 10 11 3 11 14 10 1 11 4 9 15 11 6 ing item discriminability are presented in the text: (1) the extreme groups method, and (2) thod. The exercises in this section ask you to calculate the item discriminability level, or ex, for the first five items on the University Aptitude Test (UAT). method identifies the discrimination index for each item by comparing examinees who he test (e.g., the top third) to those who did poorly on the test (e.g., the bottom third). een the proportion of "top" examinees and the proportion of "bottom" examinees who correctly is the discrimination index for that particular item. data set of 15 scores on a hypothetical test called the University Aptitude Test (UAT). analogies test consisting of 18 items. Use the table below to answer the related questions Item 1 1 1 1 1 0 0 1 0 1 0 0 1 1 0 0 Item 2 1 1 1 1 0 1 1 0 1 1 0 1 1 1 o Item 3 1 1 1 0 1 1 1 1 1 1 0 1 1 1 1 Item 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Item 5 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 Total Score 16 7 10 17 3 11 14 10 13 12 4 9 15 12 6 Thomas 0 1 1 1 0 11 Randall 1 1 1 1 0 14 Tina 0 0 1 1 0 10 LeeAnn 1 1 1 1 13 0 0 David 1 1 1 11 0 Marcia 0 0 0 1 0 Lance 1 1 1 1 9 0 Keisha 1 1 1 1 0 15 Blair 0 1 1 12 1 0 Joe 0 6 0 1 1 0 7. Find the discrimination indexes for the first five items of the UAT by using the extreme group metho this exercise, you will identify the top-scoring third of examinees (or the top 5, since there are 15 exan and the lowest-scoring third of examinees (l.e., the bottom 5). Express your answers as whole number Examinees in the top third of the group Examinees in the bottom third of the group Name Score Name Score Corey 17 Michelle 3 1 1 1 U 11 OC U 1 Oo 1 1 1 0 14 0 1 1 0. 10 1 1 1 1 0 13 1 1 1 0 12 0 0 1 0 4 1 1 1 1 0 9 1 1 1 1 0 15 0 1 1 1 0 12 0 0 1 1 0 6 ation indexes for the first five items of the UAT by using the extreme group method. In ll identify the top-scoring third of examinees (or the top 5, since there are 15 examinees) ing third of examinees (i.e., the bottom 5). Express your answers as whole numbers. op third of the group Examinees in the bottom third of the group Score Name Score 17 Michelle 3 8. Calculate the discrimination index for item 1-5 and fill in your results in the table below. You will first need to calculate Pt and Po Be sure to refer to Box 6.1 on text p. 176 for step-by-step directions on how to calculate discrimination indexes. Enter your answer with a decimal point and two significant digits (e.g., .00) Discrimination Index Item number (d; = Pr - Pb) 1 2 3 5 9. Based on the findings of the extreme group method, evaluate the extent to which UAT items 1-5 discriminate well (again, be sure to read through all of Box 6.1 on text p. 176). Item 1: Select Item 2: Select Item 3: Select Item 4: Select Item 5: Select