R Programming Language Certification Communication & Stakeholder Relations 3

Question 1

A marketing team requests that all future analyses be 'version controlled.' Which workflow change should the analyst make?

Accepted Answer

Store R scripts and R Markdown files in a Git repository

Answer

Git repositories track every change to code with author, timestamp, and commit message, providing full audit trails and enabling collaboration.

Question 2

Which knitr chunk option suppresses R code from appearing in a rendered report while still showing its output?

Accepted Answer

echo = FALSE

Answer

echo = FALSE hides the source code in the rendered document while still executing the code and displaying results, ideal for non-technical audiences.

Question 3

A finance stakeholder needs a table of summary statistics. Which R package produces publication-quality tables directly from data frames most efficiently?

Accepted Answer

kableExtra or gt

Answer

kableExtra and gt provide rich formatting options—column alignment, highlighting, footnotes—that turn R data frames into professional HTML or LaTeX tables.

Question 4

During a stakeholder meeting, an analyst presents a p-value of 0.049 as 'highly significant.' Why is this communication problematic?

Accepted Answer

A p-value just below 0.05 is borderline and should be presented with effect size and confidence interval context

Answer

Calling 0.049 'highly significant' overstates certainty; responsible communication pairs p-values with effect sizes and confidence intervals to convey practical importance.

Question 5

A stakeholder from a different department asks for the raw data underlying a chart. What R function allows you to write a data frame to a shareable CSV?

Accepted Answer

write.csv() or readr::write_csv()

Answer

write.csv() and readr::write_csv() export data frames to comma-separated files that any spreadsheet application can open.

R Programming Language Certification Practice Test

R Programming Language Certification Practice Test

R Programming Language Certification Communication & Stakeholder Relations 3