WorksheetsDAG511 Class Quiz 3
Total questions: 81
Worksheet time: 27mins
Which of the following is considered a primary source of data?
Survey responses
Newspaper article
Research report
Statistical summary
Which data source is typically second-hand information collected by someone else?
Tertiary data
Secondary data
Primary data
Raw data
What is an advantage of using secondary data sources?
Customization
Time-saving
Direct interaction with respondents
High accuracy
Which of the following is NOT an example of a secondary source of data?
Government statistics
Personal interviews
Journals
Books
Primary data collection is often __________ compared to secondary data collection.
Less reliable
More accurate
Faster
Cheaper
Which of these is an example of qualitative primary data?
Weather statistics
Customer interview responses
Sales figures
Census records
Which of the following best describes tertiary data?
Data analyzed and compiled for reference
Raw experimental results
First-hand observations
Direct survey answers
What is the main disadvantage of using primary data?
Costly and time-consuming
Lack of availability
Biased reporting
Outdated information
Which of the following is an internal source of data?
Competitor websites
Company financial records
Government publications
Industry reports
Why might researchers combine both primary and secondary data sources?
To avoid repetition
To ensure low cost
To reduce workload
To increase data validity
What is web scraping primarily used for?
Collecting data from websites
Managing internal databases
Encrypting online transactions
Designing user interfaces
Which of the following is a challenge of web scraping?
Limited websites online
Lack of automation
Data accuracy
High cost
Which programming language is commonly used for web scraping?
C
Assembly
COBOL
Python
Web scraping must comply with __________.
Random user preferences
Internal HR policies
Search engine ranking rules
Copyright and legal restrictions
Which library is often used in Python for web scraping?
Matplotlib
NumPy
BeautifulSoup
TensorFlow
CAPTCHA systems are designed to prevent __________.
User logins
Data analysis
Web scraping bots
System crashes
Which of these is an ethical concern with web scraping?
Better accuracy
Data privacy violations
Cost reduction
Improved efficiency
What is an alternative to web scraping for accessing accurate data?
APIs
Operating systems
Word processors
Firewalls
Which factor affects accuracy in scraped data?
User interface design
Font size used on site
Dynamic web page changes
Color scheme of the website
Scraped data often requires __________ before use.
Encryption only
Cleaning and validation
Direct publishing
Immediate deletion
Which of the following is NOT one of the 3Vs of Big Data?
Volume
Velocity
Variety
Validity
Big Data typically involves datasets that are too __________ for traditional systems.
Large and complex
Structured
Simple
Small
Which technology is often used to process Big Data?
Hadoop
MS Word
Photoshop
Excel only
The 'Variety' aspect of Big Data refers to __________.
Cost of collection
Different data formats
Speed of data flow
Data storage location
Which of these is an example of Big Data in real life?
One-page assignment
Small personal diary
Medical patient records
Your daily grocery list
Why is 'Velocity' important in Big Data?
Data quality improves
Data has multiple formats
Data storage is simpler
Data arrives quickly and must be processed fast
Big Data analytics can help businesses __________.
Ignore trends
Increase paperwork
Improve decision-making
Reduce employee count
Which of these is a challenge with Big Data?
Manual collection
Small dataset size
Data security
Limited storage media
Which of the following can be considered a Big Data source?
Handwritten notes
One user's homework
Single interview transcript
Social media interactions
The purpose of Big Data technologies is to __________.
Slow down processing
Handle large-scale data efficiently
Shrink file sizes
Delete unused files
Which term refers to the correctness and reliability of data?
Data redundancy
Data mining
Data scraping
Data quality
Which of the following is NOT a dimension of data quality?
Accuracy
Timeliness
Decoration
Completeness
Which issue arises when the same data exists in multiple places?
Data diversity
Data freshness
Data redundancy
Data uniqueness
Why is timeliness important for data quality?
It saves file storage
Outdated data loses relevance
It reduces server speed
It increases duplication
Which of the following ensures data is free of errors?
Data validation
Data redundancy
Data retrieval
Data compression
An incomplete customer address in a database affects which data quality dimension?
Consistency
Timeliness
Completeness
Accuracy
Consistency in data quality means __________.
Data is updated regularly
Data is compressed
Data is uniform across systems
Data is always numeric
Which is a common tool for improving data quality?
Word processing
Data cleansing
Graphic design software
Presentation slides
Which is a common tool for improving data quality?
Word processing
Data cleansing
Graphic design software
Presentation slides
Why is accuracy critical in data quality?
It reduces system costs
Incorrect data leads to wrong decisions
It increases system speed
It improves font styles
Which of the following is an example of poor data quality?
Consistent sales records
Duplicate customer entries
Updated inventory list
Validated product codes
Which of the following is a key principle of data governance?
Accountability
Guesswork
Ambiguity
Negligence
Why is metadata important in data governance?
It describes data
It encrypts data
It deletes data
It hides data
Which practice ensures sensitive data is protected?
Data masking
Data duplication
Data inflation
Data deletion
A data steward is responsible for __________.
Managing data quality
Designing buildings
Conducting sales
Marketing campaigns
Why should organizations implement data governance?
To ensure compliance
To increase costs
To eliminate data
To reduce teamwork
Which of the following best describes data governance?
Framework for managing data
System for deleting data
Method for encrypting files
Tool for writing code
Which principle involves knowing where data originates?
Data lineage
Data deletion
Data marketing
Data storage
What ensures uniform policies across departments?
Centralized governance
Decentralized governance
Data redundancy
Data overload
Which standard is often associated with governance?
ISO 38505
HTML
CSS
XML
What is a risk of poor data governance?
Regulatory penalties
Increased trust
Improved efficiency
Lower costs
What does POPIA stand for?
Protection of Personal Information Act
Protection of Public Information Access
Public Office Privacy Act
Personal Official Protection Act
Which principle under POPIA ensures individuals are informed?
Transparency
Secrecy
Ambiguity
Negligence
POPIA applies to which type of data?
Personal data
Random notes
Weather data
Anonymous jokes
Which right allows people to request corrections?
Right to rectification
Right to hide
Right to delete others' data
Right to sell data
Which organization oversees POPIA compliance?
Information Regulator
Home Affairs
Post Office
Municipality
Under POPIA, what must organizations obtain before processing?
Consent
Random approval
Bribes
No permission
What is a consequence of violating POPIA?
Fines and imprisonment
Free advertising
Awards
Increased profits
The GDPR is similar to POPIA but originates from __________.
European Union
South Africa
United States
Asia
Which principle ensures data is collected for specific purposes?
Purpose limitation
Random collection
Unlimited use
Open sharing
Under POPIA, data subjects have the right to __________.
Access their data
Ban the internet
Own a company
Create random rules
What is data wrangling?
Transforming raw data into usable format
Destroying data
Encrypting files
Deleting data
Which step comes first in data wrangling?
Data discovery
Data modeling
Data selling
Data encryption
What does data cleaning address?
Errors and inconsistencies
Color of reports
Server speed
Marketing strategy
Which tool is commonly used for data wrangling?
Python Pandas
MS Paint
Photoshop
Word
Why is data wrangling important?
Ensures accurate analysis
Makes websites faster
Increases duplication
Protects copyrights
What is another name for data wrangling?
Data munging
Data dancing
Data stealing
Data hiding
Which step involves combining multiple sources?
Data integration
Data deletion
Data printing
Data encryption
Which wrangling step detects missing values?
Data validation
Data hiding
Data duplication
Data pricing
Data wrangling prepares data for __________.
Analysis
Destruction
Encryption
Storage only
Which of the following is a challenge in wrangling?
Large datasets
Perfect data
Uniform data
Consistent systems
Which of the following is a linear data structure?
Array
Tree
Graph
Network
Which data structure uses FIFO principle?
Queue
Stack
Tree
Graph
Which data structure uses LIFO principle?
Stack
Queue
Array
Linked list
A binary tree is an example of a __________ structure.
Hierarchical
Linear
Circular
Flat
Which data structure is best for dynamic memory use?
Linked list
Array
Stack
Queue
Graphs consist of __________.
Nodes and edges
Cells and formulas
Rows and columns
Pages and chapters
Which of these is a non-linear data structure?
Tree
Array
Queue
Stack
Which operation removes the last element of a stack?
Pop
Push
Insert
Append
Which structure is ideal for hierarchical relationships?
Tree
Array
Stack
Queue
In a queue, insertion happens at the __________.
Rear
Front
Middle
Top
