Science Quiz / Types of Bias

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Can you name the Types of Bias

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Occurs with 2 closely associated factors; the effect of 1 factor distorts or confuses the effect of the other
Occurs when the group being studied changes its behavior when they realize they are being studied
Knowledge of presence of disorder alters recall by subjects
Info gathered at an inappropriate time (using a surgery to study a fatal disease-only those patients alive will be able to answer survey)
Occurs when a researcher's belief in the efficacy of the Tx changes the outcome of the Tx
Subjects are not representative relative to general population; therefore results are not generalizable
Subjects in different groups are not treated the same (more attention paid to Tx group, leading to greater compliance)
Early detection confused w/ increased survival; seen with improved screening
Nonrandom assignments to study groups

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