A data analyst receives a flat file that includes dates. The analyst needs to calculate the number of days from the dates on the file to the current date. Which of the following is the best way to complete this task?
Correct Answer:
A
This question pertains to theData Analysisdomain, focusing on date calculations. The task is to calculate the difference between dates in a file and the current date, requiring proper date handling.
✑ Convert data to date format and use date functions (Option A): Flat files often store
dates as strings (e.g., "2023-01-01"). Converting them to a date format (e.g., using Python??s datetime or SQL??s TO_DATE) allows the use of date functions (e.g., DATEDIFF) to calculate the difference to the current date, which is the best approach.
✑ Validate the date format with logical functions and use date functions to analyze
(Option B): Validation is unnecessary if conversion handles format issues, making this overly complex.
✑ Use date functions to analyze the data with no conversion (Option C): Without
converting to a date format, date functions may fail if the data is stored as strings.
✑ Transform data to a numerical value and use mathematical functions (Option D): This is inefficient and error-prone compared to using date functions.
The DA0-002 Data Analysis domain includes "applying the appropriate descriptive statistical methods," and converting to date format followed by date functions is the standard method for such calculations.
Reference: CompTIA Data+ DA0-002 Draft Exam Objectives, Domain 3.0 Data Analysis.
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The sales department wants to include the composition of total sales amounts across all three sales channels in a report. Given the following sample sales table:
Sales channel
Month
Sales (million $)
Digital January 135
Store February 145
Online March 165
Store April 200
Store May 125
Online June 155
Digital July 120
Online August 145
Digital September 160
Which of the following visualizations is the most appropriate?
Correct Answer:
B
This question pertains to theVisualization and Reportingdomain, focusing on selecting the appropriate visualization for a specific requirement. The task is to show the composition of total sales across three channels, which involves showing proportions.
✑ Pivot table (Option A): A pivot table summarizes data but isn??t a visualization; it??s
more for data exploration.
✑ Pie chart (Option B): A pie chart shows the proportion of total sales for each channel (Digital, Store, Online), which is ideal for displaying composition.
✑ KPI card (Option C): A KPI card displays a single metric, not suitable for showing composition across multiple channels.
✑ Box plot (Option D): A box plot shows data distribution (e.g., quartiles), not proportions.
The DA0-002 Visualization and Reporting domain emphasizes "translating business requirements to form the appropriate visualization," and a pie chart is best for showing the composition of totals.
Reference: CompTIA Data+ DA0-002 Draft Exam Objectives, Domain 4.0 Visualization and Reporting.
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A company wants to limit an employee's access to a production environment. Which of the following access control practices is the best to implement?
Correct Answer:
D
This question falls under theData Governancedomain, focusing on access control practices for data security. The task is to limit an employee??s access to a production environment, requiring a structured approach.
✑ Mandatory (Option A): Mandatory access control (MAC) uses strict, system-
enforced rules (e.g., military settings), but it??s overly rigid for most companies.
✑ Time-based (Option B): Time-based access limits access to specific times, which doesn??t address general production environment access.
✑ Attribute-based (Option C): Attribute-based access control (ABAC) uses attributes (e.g., department, location), but it??s complex and not the simplest solution.
✑ Role-based (Option D): Role-based access control (RBAC) assigns permissions based on the employee??s role, ensuring they only access what??s needed for their job, making it the best practice for limiting production access.
The DA0-002 Data Governance domain includes "data privacy concepts," and role-based access control is a widely adopted practice for limiting access in production environments. Reference: CompTIA Data+ DA0-002 Draft Exam Objectives, Domain 5.0 Data Governance.
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A data analyst needs to get an accurate idea of how data components are automated. Which of the following types of documentation should the analyst review first?
Correct Answer:
A
This question pertains to theData Concepts and Environmentsdomain, focusing on documentation for understanding data processes. The analyst needs to understand automation of data components, which involves data movement and processes.
✑ Data flow diagram (Option A): A data flow diagram (DFD) visualizes how data
moves through systems, including automated processes, making it the best starting point.
✑ Data explainability report (Option B): This is related to AI/ML model transparency,
not data automation.
✑ Data dictionary (Option C): A data dictionary defines data elements, not how they??re automated.
✑ Data lineage (Option D): Data lineage tracks data origin and transformations but doesn??t focus on automation processes.
The DA0-002 Data Concepts and Environments domain includes understanding "data schemas and dimensions," and a data flow diagram is key for visualizing automation. Reference: CompTIA Data+ DA0-002 Draft Exam Objectives, Domain 1.0 Data Concepts and Environments.
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Which of the following data repositories stores unformatted data in its original, raw form?
Correct Answer:
D
This question pertains to theData Concepts and Environmentsdomain, focusing on data repositories. The task is to identify a repository that stores raw, unformatted data.
✑ Data warehouse (Option A): A data warehouse stores structured, processed data
in a predefined schema, not raw data.
✑ Data silo (Option B): A data silo is an isolated repository, often structured, not designed for raw data storage.
✑ Data mart (Option C): A data mart is a subset of a data warehouse, also storing structured data.
✑ Data lake (Option D): A data lake stores raw, unformatted data in its original format(structured, semi-structured, or unstructured), making it the correct choice.
The DA0-002 Data Concepts and Environments domain includes understanding "different types of databases and data repositories," and a data lake is designed for raw data storage.
Reference: CompTIA Data+ DA0-002 Draft Exam Objectives, Domain 1.0 Data Concepts and Environments.
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