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What would a power of 80% indicate?

Which is it most effectve for?

Examine distribution disease, observing patterns?

Investigating a hypotheses.

Characteristic associated with increased risk is called?

The demogrpahic/genetic/behavioural characteristics are called?

One big problem for epidemiological studies is?

Single examination of a population with no follow up is called?

Correlations, disease and exposure number populations?

Disease already happened, retrospective look at exposure?