D465 - Data Applications Western Governors
University D 388 Questions and Overview
Questions And Answers, and Proven Strategies
to Pass First Try (2026 Edition)
R and Python similarities - ✔✔ANSWER ✔✔-Both
widely used in data science with extensive libraries.
R unique challenges - ✔✔ANSWER ✔✔-Steeper
learning curve, limited web dev capabilities.
Advantage of storing code in R - ✔✔ANSWER ✔✔-
Allows reproducibility and collaboration among
analysts.
,Programming languages and use cases -
✔✔ANSWER ✔✔-Python: web dev, data science,
ML, automation.
MIN function in spreadsheets - ✔✔ANSWER ✔✔-
Returns the smallest value in a cell range.
COUNTIF function in spreadsheets - ✔✔ANSWER
✔✔-Counts cells meeting a specified condition.
Pivot table elements - ✔✔ANSWER ✔✔-Rows,
columns, values, filters for data aggregation.
SELECT command in SQL - ✔✔ANSWER ✔✔-
Retrieves data from one or more database tables.
JOIN commands in SQL - ✔✔ANSWER ✔✔-INNER,
LEFT, RIGHT, FULL OUTER JOIN types.
,Delimiter for code chunks - ✔✔ANSWER ✔✔-Triple
backticks or markup to define code sections.
Output formats for documents - ✔✔ANSWER ✔✔-
HTML, PDF, Word (docx), Markdown.
Presentation formats - ✔✔ANSWER ✔✔-Slides,
Dashboards, Interactive web apps.
Knit button in R - ✔✔ANSWER ✔✔-Compiles R
Markdown into desired output formats.
Symbol for comments in R - ✔✔ANSWER ✔✔-
Pound sign (`#`) precedes comments in R.
Nested function usage - ✔✔ANSWER ✔✔-Simplifies
operations, improves code readability.
, Logical operators - ✔✔ANSWER ✔✔-AND (&&), OR
(||), NOT (!).
Advantage of tidyverse - ✔✔ANSWER ✔✔-Cohesive
data manipulation packages in R.
Functions in ggplot2 - ✔✔ANSWER ✔✔-ggplot(),
geom_point(), geom_line(), aes().
Plus sign in ggplot2 - ✔✔ANSWER ✔✔-Adds layers
to ggplot objects for customization.
Common errors in ggplot2 - ✔✔ANSWER ✔✔-
Incorrect aesthetic mappings, syntax
misunderstanding.
University D 388 Questions and Overview
Questions And Answers, and Proven Strategies
to Pass First Try (2026 Edition)
R and Python similarities - ✔✔ANSWER ✔✔-Both
widely used in data science with extensive libraries.
R unique challenges - ✔✔ANSWER ✔✔-Steeper
learning curve, limited web dev capabilities.
Advantage of storing code in R - ✔✔ANSWER ✔✔-
Allows reproducibility and collaboration among
analysts.
,Programming languages and use cases -
✔✔ANSWER ✔✔-Python: web dev, data science,
ML, automation.
MIN function in spreadsheets - ✔✔ANSWER ✔✔-
Returns the smallest value in a cell range.
COUNTIF function in spreadsheets - ✔✔ANSWER
✔✔-Counts cells meeting a specified condition.
Pivot table elements - ✔✔ANSWER ✔✔-Rows,
columns, values, filters for data aggregation.
SELECT command in SQL - ✔✔ANSWER ✔✔-
Retrieves data from one or more database tables.
JOIN commands in SQL - ✔✔ANSWER ✔✔-INNER,
LEFT, RIGHT, FULL OUTER JOIN types.
,Delimiter for code chunks - ✔✔ANSWER ✔✔-Triple
backticks or markup to define code sections.
Output formats for documents - ✔✔ANSWER ✔✔-
HTML, PDF, Word (docx), Markdown.
Presentation formats - ✔✔ANSWER ✔✔-Slides,
Dashboards, Interactive web apps.
Knit button in R - ✔✔ANSWER ✔✔-Compiles R
Markdown into desired output formats.
Symbol for comments in R - ✔✔ANSWER ✔✔-
Pound sign (`#`) precedes comments in R.
Nested function usage - ✔✔ANSWER ✔✔-Simplifies
operations, improves code readability.
, Logical operators - ✔✔ANSWER ✔✔-AND (&&), OR
(||), NOT (!).
Advantage of tidyverse - ✔✔ANSWER ✔✔-Cohesive
data manipulation packages in R.
Functions in ggplot2 - ✔✔ANSWER ✔✔-ggplot(),
geom_point(), geom_line(), aes().
Plus sign in ggplot2 - ✔✔ANSWER ✔✔-Adds layers
to ggplot objects for customization.
Common errors in ggplot2 - ✔✔ANSWER ✔✔-
Incorrect aesthetic mappings, syntax
misunderstanding.
