Cumulative level test: Validity, evidence, and fair evaluation: soundness, the fallacies that persuade, and the limits of what an argument can establish

Check understanding, separately from reading

12 questions · 80% to pass · no timer. This longer test revisits both units in the level. These authored questions assess recognition and application of the taught distinctions, not professional qualification. You may review the lessons and retry. Repeat attempts reuse the question bank; a remembered answer is not proof of transfer to a new situation.

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Question 1

A coroner's report states that if the alarm had sounded, the staff would have evacuated, and that the staff did not evacuate, so the alarm did not sound. An inquiry adds that the alarm was later found to be functional and that the staff had been told to ignore it. Assess the argument's validity and soundness, and state what the additional facts do to each.The form is valid by modus tollens, so the additional facts bear on premise one, which the instruction to ignore makes false or at least inapplicable, leaving the argument valid but unsound without any defect in the inferenceThe additional facts make the argument invalid, because the discovery of a functional alarm shows that the conditional premise was never true in the first place

Question 2

A commentator responds to a study finding no effect of a school reform by observing that the reform's advocates have been funded by an interested party. A second commentator responds that the study is worthless because its author has a record of political activism. Compare the two responses.Both responses are ad hominem moves and both are therefore irrelevant to whether the study's conclusion is trueThe first raises a potential undermining defeater about interests that bears on how much weight the finding should receive, while the second substitutes an attack on the person in place of any argument about the study, since political activity is not relevant to the finding's reliability

Question 3

A philosopher proposes a description of a hypothetical case in which an agent knows a fact yet cannot act on it, and argues that this refutes a proposed definition of knowledge. A critic replies that the case is physically impossible and that the agent described could not exist. Evaluate the critic's reply.The reply is off target because a thought experiment used to refute a definition needs an internally coherent scenario that the definition misclassifies, not a physically achievable one, so the reply engages a requirement the argument does not makeThe reply is decisive because an argument whose premises describe an impossible agent cannot establish anything about the actual conditions for knowledge

Question 4

A researcher reports that a brain-imaging pattern in unresponsive patients predicts later recovery, and argues on that basis that these patients are conscious. Identify what the argument would need in order to license the stronger conclusion.It needs only a larger sample, because the inference from a validated marker to the mental state follows once the correlation is firmly establishedIt needs a bridge from a predictive marker to the presence of experience, which requires either an explanatory argument or a case that the imaging response functions as a criterion, since prediction of recovery does not itself establish consciousness

Question 5

A government advises citizens to accept a new public-health measure and to stop reading contrary analyses, saying that the evidence is settled and that public doubt is itself harmful. Assess this using the level's material on testimony and on the ethics of belief.The instruction assumes preemptive authority in a domain where a genuine epistemic authority may exist, but it also suppresses the monitoring that defeaters require, so the assessment depends on whether the source is expert in the relevant domain and whether its preemption is warranted rather than assumedThe instruction is legitimate because testimony requires positive non-testimonial reasons only from speakers, not from hearers, so citizens owe the government their acceptance without further inquiry

Question 6

A rule permits detention where an officer has a reasonable belief that a person poses a serious risk. Two officers apply it to the same facts and reach different conclusions, and a court asks whether the rule is void for vagueness. Supply the analysis the level's material supports.Vagueness is established by the disagreement itself, since two reasonable decision-makers reaching different results shows the term has no determinate meaningVagueness is established by borderline cases that resist further inquiry rather than by disagreement between decision-makers, and the appropriate remedy is either a stipulated threshold the institution can defend or a division of the penumbra, not the abandonment of the rule

Question 7

A study finds that regions with more doctors per capita have higher mortality rates, and a commentator concludes that doctors cause deaths. A second commentator replies that sicker populations attract more doctors. What is the structure of the second reply, and what further step would a policy argument need?The reply identifies a common cause operating through population health, which makes the association insufficient, and a policy argument would need an intervention or natural-experiment comparison rather than the pooled associationThe reply identifies a collider, which means the association was created by conditioning rather than by any real relationship in the population

Question 8

A model predicts which defendants will reoffend accurately, and a court proposes to require judges to follow its recommendations. A critic argues that because the model's strongest predictors are prior convictions and neighbourhood, which are consequences of past enforcement, an intervention on them would not reduce reoffending. Assess the critic's argument.The argument is mistaken because a model that predicts accurately must be tracking the causes of reoffending, so intervening on its predictors would reduce itThe argument separates prediction from causal guidance correctly, since features that are traces of past enforcement are not levers, and the conclusion should be that the model may support triage but cannot justify intervention on the features it weights

Question 9

A columnist describes a proposal to lengthen prison sentences as the claim that punishment should be unlimited, refutes that claim by showing it would be barbaric, and declares the proposal defeated. A reader objects both to the description and to the inference. State both objections and the standard that would settle the matter.The description substitutes a stronger claim the proponent does not hold, which is a straw man, and the refutation of the substituted claim does not bear on the original proposal, which must be reconstructed from the proponent's own premises before any weakness is identifiedThe description is a fair reading of the proposal's implications, and the refutation stands because a proposal whose implications are barbaric is refuted by that fact

Question 10

Two departments dispute whether a shared service saves money. Department A cites an aggregate comparison showing lower costs after the service began; Department B cites the same data stratified by case type showing higher costs in every stratum. Both are correct. Diagnose the dispute and state what would resolve it.The case shows that one of the two comparisons must be in error, since a quantity cannot both fall and rise for the same populationThe case is a Simpson-type reversal in which the aggregate and stratified comparisons answer different questions, and resolution requires stating the intervention at issue and comparing like with like, not adjudicating which summary is true

Question 11

A patient is told by a clinician that a treatment is appropriate, has read a study suggesting otherwise, and notes that the study was funded by a competitor. Using the level's material, identify the defeater and state what the patient is entitled to conclude.The funding relationship is an undermining defeater bearing on the process that produced the study rather than a rebutting defeater bearing on its content, and the patient is entitled to give the clinician's guidance more weight while still asking about the specific domain in which the clinician's authority holdsThe funding relationship is a rebutting defeater that directly establishes the study's conclusion is false, so the patient should accept the clinician's advice without further question

Question 12

A researcher claims to understand why a treatment works because a model predicts its effect reliably, and a critic replies that without a mechanism the finding cannot be used to design a better treatment. Assess both claims using the level's material on explanation and on causation.Both claims are correct, because understanding just is the capacity for reliable prediction, and a finding without a mechanism licenses no intervention at allThe researcher overstates, since accurate prediction does not establish understanding, and the critic overstates too, since a well-identified effect can support design where no mechanism is yet known; the correct verdict distinguishes what each representation licenses

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