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Difficulty: HardStrengthen

To reduce errors during the preparation of sterile injectable medications, a regional hospital network required pharmacy technicians to wear high-visibility vests designating 'no-interruption zones' during compounding tasks. Over the twelve months following the policy's introduction, compounding errors fell by 35 percent across all network facilities. Because observational logs confirmed that unscheduled interruptions during compounding also dropped by 70 percent over that same period, administrators concluded that the reduction in interruptions was the primary cause of the decrease in medication errors.

Which of the following, if true, most strengthens the administrators' argument?

  1. A
    During the year following the policy change, the hospital network also implemented a computerized barcode-scanning system that automatically catches dosage errors prior to compounding.
  2. B
    Technicians reported feeling significantly less fatigue and job-related stress after the high-visibility vests were introduced.
  3. In several satellite pharmacies within the network where the vests were worn but staff continued to interrupt technicians at pre-policy rates, compounding error rates did not decrease.Answer
  4. D
    Every technician who wore a vest committed completely zero compounding errors throughout the entire twelve-month period following the policy implementation.
  5. E
    Compounding errors are inherently more hazardous to patient health than errors involving oral medications.

Answer

In several satellite pharmacies within the network where the vests were worn but staff continued to interrupt technicians at pre-policy rates, compounding error rates did not decrease.
The conclusion asserts a direct causal relationship: reducing interruptions led to fewer compounding errors. The credited choice provides strong corroborating evidence by demonstrating a negative control. In facilities where the vests were worn but the reduction in interruptions did not occur, errors did not drop. This shows that the effect requires the hypothesized cause, effectively ruling out the possibility that the mere presence of vests, increased employee vigilance from being studied, or network-wide background trends accounted for the decline.

Step-by-Step Solution

1
Analyze the argument's structure and identify the core gap
Premises: Vests were introduced; interruptions fell by 70%; compounding errors fell by 35%. Conclusion: The reduction in interruptions caused the drop in errors. Gap: A correlation between fewer interruptions and fewer errors does not prove causation; other factors or the mere introduction of the vests (such as increased self-awareness) could be responsible.
Strengthening a causal conclusion requires reinforcing the link between the proposed cause and effect or eliminating alternative explanations.
2
Identify the strengthening mechanism
Show that when the cause (reduction in interruptions) is absent, the effect (reduction in errors) does not occur, even when the vest policy is implemented.
Providing a control case showing that the effect fails to appear when the hypothesized cause is absent validates the causal attribution.
3
Evaluate the answer choices against the target mechanism
The statement regarding satellite pharmacies where vests were worn without a decrease in interruptions demonstrating no reduction in error rates confirms the causal mechanism.
This isolates the reduction in interruptions as the active causal factor, ruling out the vest's appearance or general policy awareness as the driver.

Key Concept

Strengthening Causal Claims via Control Conditions
Estimated Time:1m 15s
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