R Programming Language Certification Communication & Stakeholder Relations 5

Question 1

A data scientist wants to narrate findings in a report but hide lengthy warnings from package loading. Which knitr chunk option suppresses warnings without hiding output?

Accepted Answer

warning = FALSE

Answer

warning = FALSE suppresses warning messages generated during chunk execution while still displaying computed output and plots.

Question 2

A stakeholder requests that R analysis results be automatically sent to a shared Google Sheet after each run. Which package enables writing directly to Google Sheets from R?

Accepted Answer

googlesheets4

Answer

googlesheets4 provides read and write access to Google Sheets from R using OAuth authentication, enabling automated data pushes after each analysis run.

Question 3

When comparing two groups for an executive audience, which visualization type most clearly shows both the difference and the underlying distribution?

Accepted Answer

A raincloud plot or violin plot with overlaid boxplot and jittered points

Answer

Raincloud and violin plots simultaneously show distributional shape, summary statistics, and individual data points, giving executives a complete picture in one view.

Question 4

A stakeholder insists on using a metric that the analyst knows is statistically flawed. What is the recommended professional approach?

Accepted Answer

Document the limitation in writing, propose a better metric with supporting evidence, and defer to the stakeholder's final decision

Answer

Analysts have an obligation to flag methodological concerns in writing and offer alternatives, but ultimate business decisions belong to the stakeholder.

Question 5

Which R function renders an R Markdown document from the command line or a scheduled script without opening RStudio?

Accepted Answer

rmarkdown::render('report.Rmd')

Answer

rmarkdown::render() is the programmatic entry point for rendering .Rmd files and can be called from any R session, script, or scheduled job.

R Programming Language Certification Practice Test

R Programming Language Certification Practice Test

R Programming Language Certification Communication & Stakeholder Relations 5