Which of the following best describes data collection?

•  Transforming data into numerical format

• Gathering information from various sources for analysis

•  Eliminating duplicates in a dataset

• Visualizing data in graphs

A retail store uses an online survey to gather customer feedback. Which method is being used?

•  Observational study

• Survey/Questionnaire

•  Web scraping

•  Interviews

Which method involves observing people in their natural setting?

•  Survey

• Focus group

• Observational study

•  Web scraping

Using past company sales records is an example of:

•  Web scraping

• Existing data sources

•  Interview

• Survey

Automated tools that extract competitor website data is called:

• Survey

•  Observational study

• Web scraping

• Data validation

Which method is best for qualitative insights?

•  Surveys

•  Observations

• Web scraping

• Interviews and Focus Groups

Duplicate entries must be removed because they:

• Can skew analysis results

•  Increase accuracy

• Reduce sample size

•  Enhance performance

Standardizing all dates into MM/DD/YYYY is:

• Feature engineering

•  Data validation

• Standardizing formats

•  Imputation

Which is NOT a data cleaning technique?

•  Removing duplicates

•  Correcting errors

•  Outlier detection

• Regression modeling

A dataset shows “Manila” and “MNL.” This requires:

• Outlier detection

• Correcting errors

•  Deletion

• Encoding