Data Analysis Quiz

Which of the following is an example of nominal data?

• Temperature in Celsius

• Customer satisfaction ratings (1 to 5)

• ZIP codes

• Age in years

Which of the following data preprocessing techniques helps in normalizing data distributions?

• Data Integration

• Data Transformation

• Data Cleaning

• Data Subset Selection

What is the main goal of data reduction in preprocessing?

• To remove missing values

• To eliminate redundant and irrelevant data

• To increase dataset size for better analysis

• To visualize data more effectively

Which of the following is NOT a method of data cleaning?

• Filling in missing values

• Identifying and removing duplicate records

• Transforming data to a different scale

• Smoothing noisy data

Which of the following is a key challenge in data integration?

• Handling missing values

• Combining data from multiple sources with different formats

• Removing outliers

• Creating histograms

Which visualization method is most effective for displaying the distribution of a single numerical attribute?

• Bar Chart

• Histogram

• Pie Chart

• Line Graph

Which of the following data transformation techniques is used to bring all attributes to a similar scale?

• One-hot encoding

• Min-max normalization

• Principal Component Analysis (PCA)

• Clustering

What is the primary advantage of using clustering in data analysis?

• It predicts future trends accurately

• It helps in automatically finding groups of similar data points

• It replaces missing values with estimates

• It removes unnecessary attributes from a dataset

Which of the following is NOT a characteristic of sampling in data analysis?

• It reduces the computational complexity

• It increases the size of the dataset

• It helps in analyzing a subset of the entire dataset

• It allows for statistical inference about the entire population

Which of the following is an unsupervised learning method used in data mining?

• Decision Trees

• K-Means Clustering

• Logistic Regression

• Support Vector Machines