What is the best example of Hill's causal concept of Experiment among the statements below?

Question

BlackTom AI · Accepted Answer

To evaluate Hill's causal concept of Experiment, we look for a statement that demonstrates deliberate manipulation of an exposure and a comparison to a control group.
Option 1: "DDE blocks testosterone receptors in rats" describes a mechanism of action (blockage). While mechanistic insight is valuable, it does not by itself illustrate an experimental manipulation with a comparison group to infer causality.
Option 2: "DDE decreases prostate weight in rats" presents an outcome but lacks a defined control or comparison group. Without specifying what it is compared to, this does not clearly meet the experimental design requirement of a parallel control condition.
Option 3: "DDE decreases prostate weight in rats compared to rats without DDE exposure" explicitly includes both the exposure (DDE) and a clear comparison group (rats without DDE exposure). This aligns with the experimental element of Hill’s criteria, where the effect is assessed under manipulated conditions versus a baseline.
Option 4: "DDE decreases serum testosterone in rats" states a biological effect but, like option 2, does not specify a control or comparison, so it lacks the essential experimental design component.
Option 5: "DDE decreases serum testosterone in rates compared to rats without DDE exposure" contains a similar idea to option 4 but includes a comparative phrase; however, since it refers to testosterone levels rather than a tumorous or organ-weight outcome, it still centers on the outcome rather than the core demonstration of an intervention with a control group. Additionally, the wording has a typographical inconsistency (rates instead of rats), which undermines clarity.
Overall, the statement that best exemplifies Hill’s Experiment is option 3 because it explicitly couples exposure with a well-defined comparison, capturing the essence of manipulating a variable and observing the effect relative to a control condition.

What is the best example of Hill's causal concept of Experiment among the statements below?单项选择题

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