A group of individuals that are known before the experiment to be similar in some way that impacts the response to the treatments should include a ________________.

Question

A group of individuals that are known before the experiment to be similar in some way that impacts the response to the treatments should include a  ________________.

BlackTom AI · Accepted Answer

In experimental design, researchers often try to account for pre-existing similarities among participants that could influence how they respond to different treatments. A group that shares a characteristic known to affect outcomes is typically organized into blocks so that comparisons are made within similar units rather than across dissimilar ones.
The provided fill‑in prompt ends with a blank and the given answer choice is 'block.' This aligns with standard terminology: a block is a set of experimental units that are homogeneous with respect to a potential source of variation. By forming blocks, the experimenter reduces confounding and increases precision because treatment effects are estimated within comparable groups.
If the question intended a different term, other common possibilities might include 'strata' or 'group' depending on context, but 'block' is the conventional word used to describe this concept in randomized block designs. Blocking controls for the known similarity because units within the same block are expected to respond more similarly to treatments than units from different blocks.
Even though there are no alternative answer choices presented here, the idea remains that the blank should be filled with a term that denotes a subgroup formed by known similarities to stabilize variance and isolate treatment differences.

STAT 1450.02 SP2025 (28132) Checkpoint 9.7

A group of individuals that are known before the experiment to be similar in some way that impacts the response to the treatments should include a ________________.

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