Presentations Research & Evidence-Based Practice 4 — Questions and Answers
Question 1: An educator wants to present evidence that a new curriculum improves reading comprehension. Which study design provides the strongest causal evidence?
- Cross-sectional survey
- Retrospective chart review
- Randomized controlled trial with control group (Correct answer)
- Expert panel consensus
Correct answer: Randomized controlled trial with control group
An RCT with random assignment to treatment and control groups is the gold standard for establishing causal relationships between an intervention and an outcome.
Question 2: What does it mean when a presenter says evidence is from a 'gray literature' source?
- The research involves elderly populations
- The source is unpublished or non-peer-reviewed, such as government reports or white papers (Correct answer)
- The findings are inconclusive
- The data were collected anonymously
Correct answer: The source is unpublished or non-peer-reviewed, such as government reports or white papers
Gray literature includes reports, white papers, conference proceedings, and other materials that have not undergone formal peer review.
Question 3: A researcher presents findings from a convenience sample of 50 college students. Which generalizability concern is most relevant?
- The sample is too old to be relevant
- The sample may not represent the broader population of interest (Correct answer)
- Convenience samples are inherently unethical
- The study cannot have statistical significance
Correct answer: The sample may not represent the broader population of interest
Convenience samples are prone to selection bias, making it uncertain whether findings apply to populations beyond the specific group studied.
Question 4: In evidence-based presentations, what is the role of 'triangulation'?
- Using three slides per major finding
- Corroborating findings using multiple data sources or methods (Correct answer)
- Citing at least three peer-reviewed studies
- Drawing triangular diagrams to show relationships
Correct answer: Corroborating findings using multiple data sources or methods
Triangulation strengthens evidence by showing that different methods or data sources point to the same conclusion, reducing the risk that any one method's flaws distort results.
Question 5: A presenter shows a forest plot in a meta-analysis presentation. What does the diamond at the bottom of the plot represent?
- The largest individual study in the meta-analysis
- The overall pooled effect estimate across all studies (Correct answer)
- The study with the narrowest confidence interval
- The recommended effect size threshold
Correct answer: The overall pooled effect estimate across all studies
In a forest plot, the diamond's center represents the pooled effect size and its width represents the 95% confidence interval of the combined estimate.
Question 6: When presenting research to a lay audience, which technique best communicates risk data?
- Relative risk ratios alone
- Natural frequencies (e.g., '5 out of 100 people') (Correct answer)
- Odds ratios with confidence intervals
- Log-transformed risk values
Correct answer: Natural frequencies (e.g., '5 out of 100 people')
Natural frequencies are easier for non-statisticians to understand than ratios or percentages, reducing misinterpretation of risk magnitude.
Question 7: Which action demonstrates ethical use of research evidence in a persuasive presentation?
- Selecting only studies that support your position
- Quoting statistics out of context to maximize impact
- Disclosing funding sources and potential conflicts of interest (Correct answer)
- Omitting the study date if it strengthens your argument
Correct answer: Disclosing funding sources and potential conflicts of interest
Disclosing funding sources and conflicts of interest is an ethical obligation that allows the audience to assess potential bias in the evidence being presented.
Presentations Research & Evidence-Based Practice 4
An educator wants to present evidence that a new curriculum improves reading comprehension.
Which study design provides the strongest causal evidence?