Data Analysis Quiz

Which of the following is an example of an ordinal attribute?

• Zip Code

• Temperature in Celsius

• Education Level (High School, Bachelor's, Master's, PhD)

• Customer ID

Which visualization method is best suited for showing the distribution of a single numerical variable?

• Scatter Plot

• Line Chart

• Histogram

• Pie Chart

Which technique is NOT commonly used to handle missing data?

• Mean imputation

• Deleting records with missing values

• Assigning a unique identifier to missing values

• Forward-fill or Backward-fill

What is the primary challenge when integrating multiple datasets from different sources?

• Increasing the data size

• Schema matching and entity resolution

• Data visualization

• Creating new attributes

Which of the following transformation techniques is most useful for handling skewed data?

• Min-Max Scaling

• Z-score Normalization

• Log Transformation

• One-hot Encoding

Which of the following is a supervised discretization technique?

• Equal-Width Binning

• Equal-Frequency Binning

• Decision Tree-based Discretization

• Random Binning

Which method is commonly used for feature selection in machine learning?

• Principal Component Analysis (PCA)

• Mean Normalization

• One-hot Encoding

• Data Shuffling

What does a right-skewed histogram indicate about a dataset?

• Data is symmetrically distributed

• Most values are concentrated on the right side

• Most values are concentrated on the left side

• Data has no variance

Which clustering algorithm assumes that data is grouped into spherical clusters?

• DBSCAN

• K-Means

• Hierarchical Clustering

• Gaussian Mixture Model (GMM)

Which sampling method ensures every subgroup of the population is represented?

• Simple Random Sampling

• Stratified Sampling

• Convenience Sampling

• Systematic Sampling