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when random assignment fails to create equivalent groups, the problem of occurs. a. external validity b. sampling error c. self-selection d. third variables
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when random assignment fails to create equivalent groups, the problem of occurs. a. external validity b. sampling error c. self-selection d. third variables

User Sagar Jadhav
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7 votes

Answer:

Step-by-step explanation: A, B, C, and D because any of those 4 options can occur.

User Pratyush Dhanuka
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