Table 1 LINK Excel.Sheet.8 "
C:ocuments and Settingsamedesktopafa..xls"
 Sheet1!R1C1:R29C22 a f 5 h  * MERGEFORMAT <br />I...
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
Final Project,Isfahan University,Isfahan,Iran.
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Final Project,Isfahan University,Isfahan,Iran.

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Final Project,Isfahan University,Isfahan,Iran.

  1. 1. Table 1 LINK Excel.Sheet.8 " C:ocuments and Settingsamedesktopafa..xls" Sheet1!R1C1:R29C22 a f 5 h * MERGEFORMAT <br />Items ItemSubjects1234567891011121314151617181920Total10101011011111111100013200010100111111101011113000001000100101011118400110110110111111111155101111110011000011001161010111011111111001115701110101100011101101128011001100110111111011390010101100011010111111100100010001011101001191111011101010101101010121210111110011001100111131301000001100011100001714111101000100001000007151001010001000100101181600011110110110101101121710100100011011111011121800100110011111111011131900100100000001101011720011001111100111011011321110101101111010000111222111011100101111011111523010010100101111011111224011001000101010010119250011011011101111110114261011011001001101011112Total 1012151282215610201014182121920131824<br />Item Facility:<br /> Items with facility indexes beyond 0.63 are too easy, and items with facility indexes below 0.37 are too difficult. Here IF refers to the proportion of correct responses, while ITEM DIFFICULTY refers to the proportion of wrong responses. <br />Question number 1:<br />IF= ∑C/N, IF= 10/26=0.38 <br />Item difficulty = 1-0.38=0.62<br />Number 2:<br />IF= 12/26 = 0.0.46<br />Item difficulty = 1-0.46 = 0.54<br />Number 3:<br />IF=15/26 = 0.57<br />Item difficulty= 1-0.57=0.43<br />Number 4:<br />IF= 12/26 = 0.46<br />Item difficulty = 0.54<br />Number 5:<br />IF= 8/26= 0.30<br />Item difficulty = 0.7<br />Number 6:<br />IF = 22/26 =0.84<br />Item difficulty = 0.16<br />Number 7: <br />IF= 15/26 = 0.57<br />Item difficulty = 0.4<br />Number 8:<br />IF= 6/26 = 0.23<br />Item difficulty= 0.77<br />Number 9:<br />IF= 10/26 = 0.38<br />Item difficulty = 0.62<br />Number 10:<br />IF= 20/26 = 0.76<br />Item difficulty = 0.24<br />Number 11:<br />IF= 10/25= 0.38<br />Item difficulty = 0.62<br />Number 12:<br />IF= 14/26= 0.53<br />Item difficulty= 0.47<br />Number 13:<br />IF=18/26= 0.69 <br />Item difficulty= 0.31<br />Number 14:<br />IF= 21/26= 0.80<br />Item difficulty= 0.2<br />Number 15:<br />IF= 21/26= 0.80<br />Item difficulty = 0.2<br />Number 16:<br />IF= 9/26= 0.34<br />Item difficulty= 0.66<br />Number 17:<br />IF= 20/26 = 0.76<br />Item difficulty= 0.24<br />Number 18:<br />IF= 13/26= 0.5<br />Item difficulty= 0.5<br />Number 19:<br />IF= 18/26 = 0.69<br />Item difficulty= 0.31<br />Number 20:<br />IF= 24/26= 0.92<br />Item difficulty = 0.08<br />Table 2<br /> ItemsSubjects1234567891011121314151617181920Total10011011011011111111115210101110111111110011153111011100101111011111540011011011101111110114501010110111111111000136011001100110111111011371011111001100110011113800100110011111111011139011001111100111011011310110101101111010000111211110111010101011010101212011101011000111011011213000111101101101011011214101001000110111110111215010010100101111011111216101101100100110101111217000101001111111010111218001010110001101011111119101111110011000011001120010001000101110100119210110010001010100101192200000100010010101111823100101000100010010118240010010000000110101172511110100010000100000726010000011000111000017Total 101216982315610211014182120914131722<br />Item Discrimination:<br />The single best measure of the effectiveness of an item is its ability to separate students who vary in their degree of knowledge of the material tested, and their ability to use it. If one group of students has mastered the material and the other group had not, a larger portion of the former group should be expected to correctly answer a test item. Item discrimination is the difference between the percentages correct for these two groups. The maximum item discrimination difference is 100%. This would occur if all those in the upper group answered correctly and all those in the lower group answered incorrectly. Zero discrimination occurs when equal numbers in both groups answer correctly. Negative discrimination, a highly undesirable condition, occurs when more students in the lower group then the upper group answer correctly.<br />Negative IDis Unacceptable – check item for error<br />0% - 24% Usually unacceptable – might be approved<br />25% - 39% Good item <br />40% - 100% Excellent item<br />Item discrimination (ID)=CH-CL/½N<br />Question number 1:<br />ID= 0<br />Number 2:<br />ID= 0<br />Number 3: <br />ID= 0.33<br />Number 4:<br />ID= 0.11<br />Number 5:<br />ID= 0.11<br />Number 6:<br />ID= 0.22<br />Number 7:<br />ID= 0.7<br />Number 8:<br />ID= -0.22<br />Number 9:<br />ID= 0.44<br />Number 10:<br />ID= 0.55<br />Number 11:<br />ID=0.11<br />Number 12:<br />ID= 0<br />Number 13:<br />ID= 0.44<br />Number 14:<br />ID= 0.44<br />Number 15:<br />ID= 0.44<br />Number 16:<br />ID= 0.55<br />Number 17:<br />ID= 0.11<br />Number 18:<br />ID= 0.33<br />Number 19:<br />ID= -0.11<br />Number 20:<br />ID= 0.11<br />Table 3<br />Choice Distribution 4 3 2 1KeyItem210104318123332 1506543 14001214585815302212615551471010602865105292032141047510111614603123183231300521114121223156101911620420417355131183317321910241220<br />Question 1:<br />Same number of people selected number 2, this implies that number 2 is quite deceiving; it’s either too close too the correct choice or it involves some unnoticed problem that should be modified.<br />Question 2:<br />Few people attempted number 1 or 2. Thus, these distracters should be examined and modified.<br />Question 3:<br />Distracter number 3 is not selected by any examinee so it does not function satisfactorily and it should be modified.<br />Question 4:<br />Distracter number 2 and 4 are not selected by any examinee so they do not function satisfactorily and they should be modified.<br />Question 5:<br />Same number of people selected number 3, this implies that number 2 is quite deceiving; it’s either too close too the correct choice or it involves some unnoticed problem that should be modified.<br />Question 6:<br />Distracter number 3 is not selected by any examinee so it does not function satisfactorily and it should be modified. Few people attempted number 1 or 4. Thus, these distracters should be examined and modified.<br />Question7:<br />Few people attempted number 1. Thus, these distracters should be examined and modified.<br />Question 8:<br />Distracter number 1 is not selected by any examinee so it does not function satisfactorily and it should be modified.<br />Question 9:<br />We have got almost the same choice of distribution in this item so nothing is wrong with this item.<br />Question 10:<br />Few people attempted number 1 or 2 or 3. Thus, these distracters should be examined and modified.<br />Question 11:<br />We have got almost the same choice of distribution in this item so nothing is wrong with this item.<br />Question 12:<br />Distracter number 1 is not selected by any examinee so it does not function satisfactorily and it should be modified.<br />Question 13:<br />Few people attempted number 1 or 2 or 4. Thus, these distracters should be examined and modified.<br />Question 14:<br />Distracter number 3 or 4 is not selected by any examinee so they do not function satisfactorily and they should be modified. Few people attempted number 2. Thus, this distracter should be examined and modified.<br />Question 15:<br />Few people attempted number 1 or 2 or 4. Thus, these distracters should be examined and modified.<br />Question 16:<br />Close number of people selected number 3, this implies that number 3 is quite deceiving; it’s either too close too the correct choice or it involves some unnoticed problem that should be modified.<br />Question 17:<br />Few people attempted number 1 or 2 or 3. Thus, these distracters should be examined and modified.<br />Question 18:<br />We have got almost the same choice of distribution in this item so nothing is wrong with this item.<br />Question 19:<br />Few people attempted number 1 or 3 or 4. Thus, these distracters should be examined and modified.<br />Question 20:<br />Few people attempted number 1 or 3 or 4. Thus, these distracters should be examined and modified.<br />

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