WGU D465 DATA APPLICATIONS EXAM OA TEST BANK 2025 | ACCURATE ALL CURRENTLY
TESTING AND FREQUENTLY TESTED EXAM QUESTIONS AND ANSWERS WITH A STUDY
GUIDE | EXPERT VERIFIED FOR GUARANTEED PASS | LATEST UPDATE
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.
,WGU D465 DATA APPLICATIONS EXAM OA TEST BANK 2025 | ACCURATE ALL CURRENTLY
TESTING AND FREQUENTLY TESTED EXAM QUESTIONS AND ANSWERS WITH A STUDY
GUIDE | EXPERT VERIFIED FOR GUARANTEED PASS | LATEST UPDATE
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.
Basic aesthetic attributes in ggplot2 - (answer)x-axis, y-axis, color for plot customization.
Smoothing line usage - (answer)Visual representation of trends in data.
dplyr filter() function - (answer)Subset rows based on specific conditions in R.
VLOOKUP function in spreadsheets - (answer)Searches for values in a vertical column.
Locking table array in VLOOKUP - (answer)Prevents range changes for formula accuracy.
Different JOIN functions in SQL - (answer)INNER, LEFT, RIGHT, FULL OUTER JOIN types.
, WGU D465 DATA APPLICATIONS EXAM OA TEST BANK 2025 | ACCURATE ALL CURRENTLY
TESTING AND FREQUENTLY TESTED EXAM QUESTIONS AND ANSWERS WITH A STUDY
GUIDE | EXPERT VERIFIED FOR GUARANTEED PASS | LATEST UPDATE
COUNT vs. COUNT DISTINCT in SQL - (answer)COUNT: total rows, COUNT DISTINCT: unique values.
SELECT statement usage in SQL - (answer)Retrieving data from one or more tables.
FROM statement in SQL - (answer)Specifies tables for data retrieval in SQL queries.
Tibbles vs. data frames - (answer)Modernized data frames with improved features.
Main operators in R - (answer)Arithmetic, relational, logical, assignment operators.
sample() function for biased data - (answer)Creates random unbiased data samples.
Fill in the blank: The spreadsheet function _____ returns the number of cells within a range that match a
specified value.
COUNTIF
ARRAY
COUNT DISTINCT
VALUE - (answer)COUNTIF
What is an example of an array in a spreadsheet?
All cells with number values
Cells D7, E14, and F20
The values in cells B2 through B31
All cells with values greater than 100 - (answer)The values in cells B2 through B31
TESTING AND FREQUENTLY TESTED EXAM QUESTIONS AND ANSWERS WITH A STUDY
GUIDE | EXPERT VERIFIED FOR GUARANTEED PASS | LATEST UPDATE
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.
,WGU D465 DATA APPLICATIONS EXAM OA TEST BANK 2025 | ACCURATE ALL CURRENTLY
TESTING AND FREQUENTLY TESTED EXAM QUESTIONS AND ANSWERS WITH A STUDY
GUIDE | EXPERT VERIFIED FOR GUARANTEED PASS | LATEST UPDATE
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.
Basic aesthetic attributes in ggplot2 - (answer)x-axis, y-axis, color for plot customization.
Smoothing line usage - (answer)Visual representation of trends in data.
dplyr filter() function - (answer)Subset rows based on specific conditions in R.
VLOOKUP function in spreadsheets - (answer)Searches for values in a vertical column.
Locking table array in VLOOKUP - (answer)Prevents range changes for formula accuracy.
Different JOIN functions in SQL - (answer)INNER, LEFT, RIGHT, FULL OUTER JOIN types.
, WGU D465 DATA APPLICATIONS EXAM OA TEST BANK 2025 | ACCURATE ALL CURRENTLY
TESTING AND FREQUENTLY TESTED EXAM QUESTIONS AND ANSWERS WITH A STUDY
GUIDE | EXPERT VERIFIED FOR GUARANTEED PASS | LATEST UPDATE
COUNT vs. COUNT DISTINCT in SQL - (answer)COUNT: total rows, COUNT DISTINCT: unique values.
SELECT statement usage in SQL - (answer)Retrieving data from one or more tables.
FROM statement in SQL - (answer)Specifies tables for data retrieval in SQL queries.
Tibbles vs. data frames - (answer)Modernized data frames with improved features.
Main operators in R - (answer)Arithmetic, relational, logical, assignment operators.
sample() function for biased data - (answer)Creates random unbiased data samples.
Fill in the blank: The spreadsheet function _____ returns the number of cells within a range that match a
specified value.
COUNTIF
ARRAY
COUNT DISTINCT
VALUE - (answer)COUNTIF
What is an example of an array in a spreadsheet?
All cells with number values
Cells D7, E14, and F20
The values in cells B2 through B31
All cells with values greater than 100 - (answer)The values in cells B2 through B31
