Data Visualization and Dashboards: Summary and Assessment
Knowledge Check
Quiz
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Knowledge Check
Quiz
Knowledge Check
Answer these questions to check understanding.
What should determine the choice of chart type?
- A. The monitoring or reporting question.
- B. The brightest color palette.
- C. The number of packages installed.
- D. The file size.
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Answer: A
Why are denominators important in visualizations?
- A. They determine how counts and percentages should be interpreted.
- B. They are only needed for statistical tests.
- C. They make charts decorative.
- D. They are not relevant to bar charts.
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Answer: A
Which `ggplot2` geometry is commonly used for a bar chart based on precomputed counts?
- A. `geom_col()`
- B. `geom_point()`
- C. `geom_histogram()`
- D. `geom_line()`
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Answer: A
What does a cumulative enrollment plot show?
- A. The total number of enrolled participants over time.
- B. Only missing values.
- C. Only laboratory results.
- D. The number of R scripts written.
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Answer: A
What are the two main parts of a basic Shiny app?
- A. User interface and server.
- B. Protocol and consent form.
- C. CSV and PDF.
- D. Query and answer.
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Answer: A
Why should dashboards show refresh dates?
- A. Users need to know how current the displayed data are.
- B. R requires a date to draw plots.
- C. Refresh dates replace data validation.
- D. Dates make dashboards interactive.
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Answer: A
What is a risk of dashboard filters in small datasets?
- A. They may increase re-identification risk.
- B. They always improve privacy.
- C. They delete raw data.
- D. They prevent access control.
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Answer: A
What should happen if a dashboard identifies an incorrect database value?
- A. The value should be corrected through the approved source database workflow.
- B. The dashboard should silently edit it.
- C. The PDF should be changed manually.
- D. The raw export should be overwritten.
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Answer: A