Information and IdeasVery hardFinding that weakens a claim about an improvement's cause
Information and Ideas practice question
A hospital claims that its new appointment system cut waiting times, since average waits fell from 40 minutes to 25 in the month after it was introduced.
Which finding, if true, would most directly weaken the hospital's claim?
- A. In the same month the hospital opened two extra consulting rooms and hired three more doctors.Correct
- B. Patients say the new system is easy to use.
- C. The system was designed by a software company.
- D. Waiting times are measured at reception.
Answer: A. In the same month the hospital opened two extra consulting rooms and hired three more doctors.
More rooms and doctors in the same month offer another explanation for the shorter waits.
Why the other answers are wrong
- B. Patients say the new system is easy to use.
- Ease of use doesn't show it cut waits.
- C. The system was designed by a software company.
- Who designed it is irrelevant.
- D. Waiting times are measured at reception.
- Measurement location doesn't bear on the cause.
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