Questions: Causal Reasoning in Writing

Question 1

Ice cream sales and drowning rates both rise in summer. A writer concludes: 'Ice cream consumption causes drowning because the data clearly shows they increase together.' What is the fundamental flaw in this argument?

• A. The dataset is too small to draw any conclusions
• B. The writer mistakes correlation for causation — a third variable (summer heat) plausibly causes both, and no mechanism linking ice cream to drowning is established
• C. The causal chain is too long to be credible
• D. The writer confused necessary and sufficient conditions

Answer: (B)

This is the classic confounding-variable problem. Two things can correlate perfectly while being entirely unrelated causally. A causal argument must provide a plausible mechanism (how does A produce B?) and rule out rival explanations — including third variables that could drive both. Without this, even striking correlations prove nothing about causation.

Question 2

A student argues: 'Countries with higher chocolate consumption have more Nobel Prize winners per capita. Therefore, eating chocolate improves cognitive ability.' Which addition would most strengthen this causal argument?

• A. A larger dataset covering more countries over more years
• B. A proposed biological mechanism — e.g., flavonoids in chocolate improving blood flow to the brain — supported by experimental evidence
• C. Testimonials from Nobel winners describing their chocolate habits
• D. A timeline showing that chocolate consumption in each country rose before its Nobel wins increased

Answer: (B)

A mechanism — an account of *how* A produces B — is the core requirement a causal argument must supply. More data strengthens correlation but still leaves causation unestablished. Testimonials are anecdote, not evidence. A timeline addresses temporal order (A before B) but still doesn't rule out confounders. Only a demonstrated biological mechanism, especially one supported by controlled experiments, actually closes the gap between correlation and causation.

Question 3

A causal chain argument becomes weaker with each additional link, because each link requires its own evidence and a single unsupported link breaks the entire chain.

• T. True
• F. False

Answer: True

Causal chains compound uncertainty: to argue that poverty causes poor nutrition, which causes reduced cognitive development, which causes lower test scores, you need separate evidence for each causal link and a mechanism for each. If any one link fails, the chain fails. This is why contested policy arguments often dispute not the endpoints but one intermediate step — that single broken link is enough to defeat the whole argument.

Question 4

If event A reliably occurs before event B in nearly every documented case, that temporal precedence is sufficient to establish that A causes B.

• T. True
• F. False

Answer: False

Temporal precedence (A always before B) is a necessary but not sufficient condition for causation. The logical fallacy of assuming otherwise is called *post hoc ergo propter hoc* — 'after this, therefore because of this.' The rooster crows before sunrise every day, but the crowing doesn't cause the sun to rise. Causation requires a mechanism explaining how A produces B, and the ruling-out of alternative explanations (confounding variables, coincidence, reverse causation).

Question 5

Why is identifying a mechanism necessary for a causal argument, and what does a mechanism explain that correlation alone cannot?

Model answer: A mechanism explains *how* A produces B — the process, pathway, or relationship through which the cause generates the effect. Correlation shows that A and B tend to occur together, but it cannot distinguish between: A causes B, B causes A, a third variable causes both, or the pattern is coincidence. A mechanism rules out those alternatives by providing a plausible account of the causal process, which can then be tested independently.

Without a mechanism, a causal claim is vulnerable to the objection that the observed correlation could have any number of alternative explanations. Establishing mechanism is what transforms a pattern observation ('these two things go together') into a causal argument ('here is why one produces the other'). In Toulmin terms, the mechanism is the warrant: the logical bridge that licenses the move from evidence to claim.