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Difficulty: Very hardCorrelation vs. Causation

Linguistic anthropologists analyzing digital communication trends found that online forums with the highest frequency of newly coined vocabulary also exhibit the lowest rates of user retention over a five-year period. The anthropologists conclude that the continuous introduction of novel terminology alienates casual participants, which in turn causes them to abandon these forums.

Which one of the following most accurately describes a flaw in the anthropologists' reasoning?

  1. A
    It bases its conclusion on the unstated assumption that the digital communication trends observed over the five-year period were accurately recorded by the anthropologists.
  2. B
    It mistakenly presumes that an online forum with a low frequency of newly coined vocabulary will necessarily experience high rates of user retention.
  3. It fails to exclude the possibility that a single independent factor is causally responsible for both of the phenomena that the anthropologists observed.Answer
  4. D
    It confuses the rate at which users abandon the online forums with the absolute number of casual participants who remain active.
  5. E
    It concludes that a low rate of user retention is the primary cause of the high frequency of newly coined vocabulary, when the reverse is equally plausible.

Answer

The correct answer is the option stating that the argument fails to exclude the possibility that a single independent factor is causally responsible for both observed phenomena.
The argument observes a correlation between Phenomenon A (new vocabulary) and Phenomenon B (low user retention) and assumes that A causes B. The correct answer points out a classic flaw in this reasoning: it ignores the possibility that a third, underlying factor (such as the forums being dedicated to highly volatile, short-lived trends) might independently cause both the rapid generation of slang and the rapid departure of users.

Step-by-Step Solution

1
Identify the argument's premises.
Premise: There is a correlation between high frequency of new vocabulary and low rates of user retention.
Deconstructing the argument is the first step to evaluating its logical soundness.
2
Identify the argument's main conclusion.
Conclusion: The introduction of novel terminology causes users to abandon the forums.
Understanding exactly what the author is trying to prove reveals the logical leap.
3
Evaluate the logical gap between the premise and conclusion.
The author moves directly from a statistical correlation to a definitive causal relationship (A causes B).
Whenever an author assumes causation from correlation, the argument is vulnerable to alternative explanations.
4
Anticipate the standard alternative explanations for causal flaws.
The correlation could be caused by reverse causality (B causes A), coincidence, or a third common variable (C causes both A and B).
Pre-phrasing the flaw helps bypass intentionally confusing language in the answer choices.
5
Evaluate the options against the anticipated flaws.
The correct option abstractly describes the 'third variable' flaw, pointing out that an independent factor could cause both the new vocabulary and the low retention.
This precisely identifies a glaring logical vulnerability in the author's reasoning.

Key Concept

Correlation vs. Causation (Third Variable/Common Cause)
Estimated Time:2m 0s
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Topics

Correlation vs. Causation

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