1 / 21

Administration

Administration. Administering Scoring Statistical computation. Administering. Preparing the testing environment - for paper-and-pencil tests - for listening tests - for speaking tests Communicating the instructions Detailed instructions for examiners and invigilators

lynsey
Télécharger la présentation

Administration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Administration Administering Scoring Statistical computation

  2. Administering • Preparing the testing environment - for paper-and-pencil tests - for listening tests - for speaking tests • Communicating the instructions Detailed instructions for examiners and invigilators • Maintaining a supportive testing environment The role of examiners and invigilators • Collecting the tests

  3. Administration: Scoring Objective items Writing Total Score Total Score Adjusted score University A 65.00 30.01 20.00 13.80 10.63 Qinghua Uni. 65.00 45.41 20.00 12.88 14.89 Beijing Uni. 65.00 43.78 20.00 18.13 14.22 (Li, 1997: 114)

  4. Administration: scoring • Scoring objective test items • Scoring subjective test items Measures for quality control • Marking scheme / Rubrics • Rater training • Place • Examinees’ names not exposed • Random allocation of test papers to raters • A third rater when necessary • Computer adjustment

  5. Administration: Statistical computation • Analysis and evaluation of the test • Score distribution • skewness (positive vs. negative) • kurtosis (leptokurtic vs. platykurtic) • score interpretation • Score interpretation • Item analysis • Conclusion and feedback

  6. Normal Distribution http://stat-www.berkeley.edu/~stark/Java/NormHiLite.htm

  7. Sk=0

  8. Sk<0 Sk>0

  9. Leptokurtic Ku>0) Mesokurticku=0 Platykurtic Ku<0)

  10. Reliability • Regression matrix (correlation) • Factor analysis MET1985至1987各年客观题部分的信度数据

  11. Regression matrix (correlation) (Li, 1997: 129)

  12. ( Li, 1997: 130) • factor analysis

  13. Administration: Statistical computation • Score interpretation TOEFL scores NMET scores

  14. Administration: Statistical computation • item analysis (in pretest study and after the test) • subjective items (Rasch model) • objective items • facility value (pass rate): the ratio between those who pass the item and the total number of testees • Difficulty (Δ,delta) • Discriminability (rbis)

  15. Statistical computation • Simple: • Rank students according to their total scores • Divide them into three groups (top and bottom have equal numbers of students) • Count how many students in the top group get an item right, and how many in the bottom group • Formula: • Example

  16. D.I.= = = .047619 Statistical computation Facility value=44/62=71%

  17. Statistical computation • Simple: • Rank students according to their total scores • Divide them into three groups (top and bottom have equal numbers of students) • Count how many students in the top group get an item right, and how many in the bottom group • Formula: • Example • Point biserial correlations (Rbis)

  18. (Li, 1997: 274 )

More Related