1 pts D Question 3 A veterinarian is interested in studying the causes of entero

Question

1 pts D Question 3 A veterinarian is interested in studying the causes of enteroliths, stones that form in the gut of horses. A n observational study comparing the diet of horses admitted to the veterinary hospital with enteroliths and the diet of horses admitted for other reasons does not allow causal conclusions to be drawn because O an observational study can only establish correlations unless the investigator is double blinded. 0 the presence of lurking variables that were not controlled for O the study did not match horses. OAll of the choices are correct.

Explanation / Answer

Answer is the presence of lurking variables that were not controlled for as in addition to the explanatory variable (method) and the response variable (success or failure), a third, lurking variable is tied in (or confounded) with the explanatory variable’s values, and may itself cause the response to be a success or failure.

Since the difficulty arises because of the lurking variable’s values being tied in with those of the explanatory variable, one way to attempt to unravel the true nature of the relationship between explanatory and response variables is to separate out the effects of the lurking variable. In general, we control for the effects of a lurking variable by separately studying groups that are defined by this variable.

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