A community centre runs an experiment on posters encouraging people to attend a vaccination clinic. One poster gives a direct instruction, “Book today.” The...
Question 1 Report
A community centre runs an experiment on posters encouraging people to attend a vaccination clinic. One poster gives a direct instruction, “Book today.” The other asks a question, “Have you protected your family?” Attendance is counted for four weeks.
(a) Use this study to describe three variables that should be controlled. [3]
(b) Evaluate two strengths and two limitations of counting attendance as the outcome measure. [4]
Answer Details
(a) Any three from: display posters in comparable locations [1]; run both conditions for the same length of time [1]; provide the same clinic dates and appointment availability [1]; keep poster size and colour similar [1]; avoid different local publicity during one condition [1]. (b) Strengths, any two from: attendance is objective [1]; it measures actual health behaviour rather than stated intention [1]; totals are easy to compare across conditions [1]. Limitations, any two from: people may attend because of a doctor's reminder rather than the poster [1]; attendance does not show whether people read or understood the communication [1]; weather, illness outbreaks or transport may affect numbers [1].
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