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1) Consider that, in the hypothetical study given in the table below, cases underestimated their exposure and, as a result, 20% of exposed cases were falsely classified as unexposed, however that the classification of controls was not affected.
True results of the hypothetical case-control study with no measurement error.
Cases
Controls
Total
Exposed
300
250
550
Unexposed
100
150
400
800
Explain whether this kind of the misclassification is random or systematic? Specify is it differential or non-differential?
b) Specify the effect it would have on the results of study?
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