Data Mining and Analysis Quiz

What is clustering in data mining?

• Grouping similar data points together

• Deleting unnecessary data

• Data visualization technique

• Data transformation method

Which technique is used to reduce data dimensions?

• Data discretization

• Feature selection

• Principal Component Analysis (PCA)

• Both b and c

Sampling in data analysis is used to:

• Reduce dataset size while maintaining representativeness

• Increase dataset size

• Remove attributes

• Transform data

Which of the following is NOT a type of attribute?

• Nominal

• Ordinal

• Structural

• Ratio

Which step comes first in data preprocessing?

• Data transformation

• Data cleaning

• Data integration

• Data visualization

Which method is used to fill missing data values?

• Deleting records

• Mean imputation

• Random sampling

• All of the above

A histogram is used for:

• Displaying frequency distributions

• Clustering data

• Transforming data

• Cleaning data

What is data discretization?

• Converting continuous data into categorical data

• Removing data outliers

• Combining data sources

• Visualizing data in bar charts

Which type of data pattern represents a predictable trend over time?

• Sequential

• Random

• Categorical

• Clustered

What is an outlier in a dataset?

• A missing value

• An extreme value deviating from other observations

• A categorical variable

• A data type