Recognizing hypothetical case-control study

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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	250
Total	400	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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