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Author Question: A test constructor is interested in determining the reliability of a certain item on a new test of ... (Read 61 times)

rmenurse

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on: Jun 20, 2018
A test constructor is interested in determining the reliability of a
  certain item on a new test of aggressiveness, the ASAP (Aggressive Syndrome Assessment Profile). The items were scored 1 for showing aggressiveness and 0 for passivity.
 
  For each subject, the total score on the test is reported, high scores indicating higher levels of aggressiveness.
 
  Subj Item Score Total Score
   X Y
  1. 1 10
  2. 1 12
  3. 1 10
  4. 1 11
  5. 1 15
  6. 0 4
  7. 0 5
  8. 0 6
  9. 0 9
  10. 0 7
 
  Find the point-biserial reliability value for the selected item.
 
 
 What will be an ideal response?

Question 2

A researcher wishes to establish the DI (Discrimination Index) for a
  series of five items contained in a new test being developed to assess Whole
  Language Readiness (WLR).
 
  The data are as follows:
  Item Proportion Correct Proportion Correct
   For Top Third For Bottom Third
  a. .70 .60
  b. .70 .50
  c. .50 .20
  d. .95 .70
  e. .45 .50


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Sarahjh

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Reply #1 on: Jun 20, 2018
Answer to Question 1

rpbis = .833 Sig p<.01

Answer to Question 2

a DI=.100


rmenurse

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  • Posts: 513
Reply 2 on: Jun 20, 2018
Thanks for the timely response, appreciate it

sailorcrescent

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  • Posts: 334
Reply 3 on: Yesterday
Wow, this really help

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