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We should be very careful of the problem of _______. The test units who drop out may be systematically different from the test units who remain. For example, salespeople who drop out of a sales training program may be the ones who do not gain anything from the program. In that case, the experiment will only measure the change of effectiveness for the test units who do not leave.     history     mortality     Main testing effect     Selection bias

We should be very careful of the problem of _______. The test units who drop out may be systematically different from the test units who remain. For example, salespeople who drop out of a sales training program may be the ones who do not gain anything from the program. In that case, the experiment will only measure the change of effectiveness for the test units who do not leave.     history     mortality     Main testing effect     Selection bias

Practical Management Science
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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Question 13

We should be very careful of the problem of _______. The test units who drop out may be systematically different from the test units who remain. For example, salespeople who drop out of a sales training program may be the ones who do not gain anything from the program. In that case, the experiment will only measure the change of effectiveness for the test units who do not leave.
   
history
   
mortality
   
Main testing effect
   
Selection bias
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