ITBAN 3 – Fundamentals of Analytics Modelling Data Preprocessing Quiz

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What is one of the major tasks in data preprocessing?

Model deployment

Data cleaning (correct)

Algorithm training

Data visualization

Which task involves scaling data to a specific range during data preprocessing?

Data reduction

Data transformation (correct)

Data discretization

Data integration

Why might missing data occur in a dataset?

High importance placed on entering all data

Perfect data entry by all employees

Due to consistent recording practices

Equipment malfunction (correct)

Which preprocessing task aims to reduce the volume of data while maintaining analytical results?

Data reduction Signup and view all the answers

What is a common reason for missing data in sales records according to the text?

Misunderstanding of data importance Signup and view all the answers

Which step of data preprocessing involves integrating multiple databases or files?

Data integration Signup and view all the answers

Which of the following is the most effective way to handle a missing class label in a classification task?

Ignore the tuple Signup and view all the answers

What is the definition of noise in the context of data?

Random error in a measured variable Signup and view all the answers

Which of the following is not a common cause of incorrect attribute values in data?

Inconsistency in variable naming Signup and view all the answers

What is the purpose of the binning method in handling noisy data?

To smooth the data by replacing values with bin means or medians Signup and view all the answers

Which of the following is a more sophisticated approach to filling in missing values compared to using a global constant or attribute mean?

Using the most probable value based on inference Signup and view all the answers

Which of the following is not a common data quality issue that requires data cleaning?

Unstructured text data Signup and view all the answers

What is the main purpose of using external references for manual correction in data preprocessing?

To correct redundant data Signup and view all the answers

What is the primary goal of data integration?

Schema integration Signup and view all the answers

What is the entity identification problem in data integration?

Identifying real world entities from multiple data sources Signup and view all the answers

Why might attribute values for the same real world entity be different in data integration?

Due to different scales used in the data Signup and view all the answers

What is the purpose of resolving data value conflicts in data integration?

To ensure consistency when attribute values differ for the same entity Signup and view all the answers

What is the purpose of clustering in data preprocessing?

Detect and remove outliers Signup and view all the answers

Which method divides the range into N intervals of equal size in data discretization?

Equal-width partitioning Signup and view all the answers

What issue might arise when using equal-width partitioning for discretization?

Outliers dominating presentation Signup and view all the answers

Which method involves dividing the range into intervals with approximately the same number of samples?

Equal-depth partitioning Signup and view all the answers

What does smoothing by bin means entail?

Finding the average value in each bin Signup and view all the answers

In what scenario would smoothing by bin boundaries be preferred?

Maintaining original range information Signup and view all the answers

What is the primary reason for data preprocessing?

To improve the quality of the data Signup and view all the answers

Which of the following is NOT a key aspect of data quality according to the passage?

Scalability Signup and view all the answers

What is the relationship between data quality and mining results according to the passage?

Data quality and mining results are directly related Signup and view all the answers

Which of the following is an example of a data quality issue mentioned in the passage?

Data is incomplete Signup and view all the answers

What is the primary purpose of a data warehouse according to the passage?

To integrate and consolidate quality data Signup and view all the answers