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how should she determine if her new test questions are good and what type of correlation should she find ? What type of reliability is this ?

how should she determine if her new test questions are good and what type of correlation should she find ? What type of reliability is this ?

Ciccarelli: Psychology_5 (5th Edition)
Ciccarelli: Psychology_5 (5th Edition)
5th Edition
ISBN:9780134477961
Author:Saundra K. Ciccarelli, J. Noland White
Publisher:Saundra K. Ciccarelli, J. Noland White
Chapter1: The Science Of Psychology
Section: Chapter Questions
Problem 1TY
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"Let’s pretend Caitlin is a clinician and she is making a new index to give to people to assess whether they have depression or not. It’s a questionnaire of 30 questions and the higher someone’s score on this test, the more likely they are to have depression. She wants to compare this to Beck’s Depression Inventory which has 21 questions and also shows that a higher score means people are more likely to be depressed. Firstly, how should she determine if her new test questions are good and what type of correlation should she find ? What type of reliability is this ? After this, what should be her next step ? Why does she need to do this ? What type of correlation should she find in this next step ?"
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