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WorksheetsBig Data Quiz
Total questions: 20
Worksheet time: 10mins
What does "Big Data" refer to?
Small datasets stored in Excel
Large, complex datasets that traditional tools can’t handle
Data stored on personal computers
Only social media data
Which of the following is NOT one of the 5 Vs of Big Data?
Volume
Velocity
Visualization
Variety
Which of these tools is primarily used for Big Data processing?
Hadoop
Excel
Canva
Trello
Structured data is:
Text-heavy and qualitative
Organized in rows and columns
Without predefined format
Always unorganized
Which of the following is a NoSQL database?
MySQL
MongoDB
Oracle
MS Access
What is the primary role of a Business Analyst in a Big Data project?
Writing machine learning algorithms
Interpreting data insights to guide business decisions
Managing data storage
Developing mobile apps
What is machine learning primarily used for?
Manual data entry
Automating predictions and pattern recognition
Replacing data storage systems
Creating charts manually
Supervised learning requires:
No data
Labeled data for training
Only text data
Random datasets
Which algorithm is used for classification problems?
Linear Regression
Logistic Regression
K-Means Clustering
PCA
What does the p-value help determine in hypothesis testing?
Data storage limit
Significance of results
The mean of a dataset
Correlation strength
What is the difference between descriptive and inferential statistics?
Descriptive analyzes samples; inferential describes data
Descriptive summarizes data; inferential makes predictions
Both are identical
Inferential doesn’t use data
What does a correlation coefficient close to +1 indicate?
Weak negative relationship
Strong positive relationship
No relationship
Data is skewed
What is overfitting in machine learning?
The model performs poorly on training data
The model performs well on both training and test data
The model memorizes training data but fails to generalize
The model ignores outliers
Which test would you use to compare means between two small samples?
Z-test
Chi-square test
T-test
ANOVA
In project management, “scope creep” refers to:
Adding new tasks without adjusting time or cost
Reducing project size
Tracking project progress
Increasing budget intentionally
What is the main idea of the Central Limit Theorem?
Sample means are normally distributed for large samples
All data follows a uniform distribution
Population mean equals zero
Sampling reduces errors completely
How does cross-validation help in model evaluation?
By training only once
By dividing data into multiple subsets to assess model consistency
By using external datasets
By increasing overfitting
When would you use an ANOVA test?
Comparing proportions
Comparing means across more than two groups
Testing independence
Calculating correlation
What is a sampling distribution?
The distribution of raw data
The distribution of a statistic (like mean) across many samples
The distribution of errors
The distribution of random numbers
In a confusion matrix, which metric indicates how often the model correctly predicts the positive class?
Precision
Recall
Accuracy
Specificity
