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Chance can affect how true the outcome is of a study?
Bias means the same as chance?
A confounder affects both the exposure being studied and the outcome of interest?
If a study is internally valid it can be safely applied to your population?
For a study to be externally valid it must appropriate to every reader and applicable to all of their respective patient populations?
Homogeneity relates to things being the same?
If studies compare different cut offs for abnormal values or deliver treatment in significantly different ways whilst trying to assess the same thing they could be referred to as heterogenous?