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Zorluk: Çok zorWeakening Arguments

To combat outbreaks of multi-drug resistant Acinetobacter baumannii in intensive care units, a regional health network replaced all alcohol-based hand rubs with an advanced chlorhexidine-glucoheptonate formulation. Over the subsequent twelve-month period, hospital-acquired A. baumannii infection rates in these units dropped by 45 percent. Concluding that the new formulation was directly responsible for this reduction, the network's epidemiological board mandated its exclusive use across all patient departments to suppress hospital-acquired bacterial infections. Which of the following, if true, most seriously undermines the epidemiological board's conclusion?

  1. At the start of the twelve-month period, the health network simultaneously implemented an automated ultraviolet-C room sterilization protocol in its intensive care units that independently eradicates surface-bound A. baumannii.Cevap
  2. B
    Laboratory assays demonstrate that the chlorhexidine-glucoheptonate formulation neutralizes bacterial cell membranes significantly faster than standard alcohol-based sanitizers do.
  3. C
    Hospital-acquired fungal infections in non-intensive care wards increased slightly during the same twelve-month observation period.
  4. D
    The financial cost of procuring the chlorhexidine-glucoheptonate formulation exceeds the annual budget allocated for standard hygiene supplies.
  5. E
    Patients admitted to intensive care units typically present with more severe underlying immunosuppression than patients admitted to general medical wards.

Cevap

The argument is most seriously weakened by the statement that the health network simultaneously implemented an automated ultraviolet-C room sterilization protocol in its intensive care units that independently eradicates surface-bound A. baumannii.
The correct answer weakens the causal claim by introducing a confounding variable. If the hospital introduced automated ultraviolet-C room sterilization in the intensive care units at the exact same time as the new hand sanitizers, the 45 percent drop in A. baumannii infections could have been caused entirely or primarily by the UVC sterilization rather than the chlorhexidine formulation.

Adım Adım Çözüm

1
Analyze the argument structure
Premise: Infection rates dropped 45% after introducing chlorhexidine rubs in ICUs. Conclusion: The chlorhexidine rubs caused the drop and will suppress infections network-wide.
Identifying the author's causal claim (sanitizer -> infection drop) isolates the core logical vulnerability.
2
Evaluate the causal inference for vulnerabilities
The argument assumes no other concurrent change caused the drop in ICU infection rates.
Causal conclusions based on observational before-and-after data are vulnerable to alternative co-occurring causes (confounding variables).
3
Select the option that supplies an alternative explanation
The concurrent implementation of ultraviolet-C room sterilization in ICUs provides an independent cause for the reduction in A. baumannii.
If another effective intervention was introduced at the exact same time in the exact same location, the reduction cannot be confidently attributed to the hand sanitizer formulation.

Anahtar Kavram

Causal Flaw: Alternative Explanation / Confounding Variable
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Konular

Weakening Arguments

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