The need to validate the result of any research study is to make sure the groups or participants are in accord when it comes to results. What are some examples of threats to the validity? Would it be what is called confound and error variance. Is confounding when a problem affects one group and not the other group. Does error variance affect one group more than the other group?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
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The need to validate the result of any research study is to make sure the groups or participants are in accord when it comes to results. What are some examples of threats to the validity? Would it be what is called confound and error variance. Is confounding when a problem affects one group and not the other group. Does error variance affect one group more than the other group? 

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