← Planning & Conducting Public Health Studies

Practice & understand

Formative practice with explanations. No registration or certification.

1. A study needs 400 completed eligible interviews and expects 80% response. With other design factors already included, how many eligible people should the plan approach?01. Fieldwork workload320480500800

2. A participant asks whether all information can be deleted after findings have been published in aggregates. Which response is most appropriate?06. Withdrawal proceduresExplain the actual withdrawal options and limits in the reviewed plan without promising what cannot be donePromise unconditional deletion of every published resultRefuse to discuss withdrawalAsk another household to decide

3. A questionnaire asks, “Is your water safe and affordable?” What is the most important measurement problem?03. Questionnaire designThe question has too few wordsThe answer must be numericIt can only be used in a trialIt combines two constructs that may have different answers

4. A pilot form takes ten minutes to finish, but participants interpret its recall period differently. What is the best response?04. Pilot and translationProceed because completion time proves usabilityRevise and retest comprehension and translation, documenting the version changeAverage the different recall periods during analysisTell each interviewer to improvise a personal explanation

5. All field documents exist, but a translated item has not been tested and nobody has restored a backup. What is a defensible readiness recommendation?08. Field readinessProceed because document completeness guarantees readinessResolve and document the material gaps, retest and obtain the appropriate readiness decisionDelete all pilot evidenceChange the recruitment target to conceal the delay

6. Two dataset rows have the same study ID but different visit dates. What should happen before either is deleted?07. Data-quality auditReplace both rows with their meanKeep the row with the most favorable resultAssume both are entry errorsCheck whether repeated visits are valid under the design and investigate provenance

7. A selected household has nobody available at the first visit. What should an interviewer do?02. Recruitment SOPRecord the observed outcome and follow the prespecified repeat-contact procedureClassify it immediately as a refusalInterview the nearest willing household insteadRecord a completed interview with missing answers

8. A community leader agrees to a survey and asks all households to participate. What should the research team clarify?05. Consent and engagementLeader agreement guarantees individual understandingThe team no longer needs participant informationCommunity support does not replace the applicable individual consent process or voluntarinessEvery refusal can be treated as ineligibility