Null Values Quiz

What you'll be asked

1. In the context of data profiling, what does a Null value represent?
2. You are cleaning a dataset where the 'Product Weight' column has 5% missing values. The data is normally distributed without significant outliers. Which imputation method is generally preferred to maintain the distribution's central tendency?
3. While profiling a customer database, you notice that the 'Middle Name' column is 70% null. How should you interpret this from a business logic perspective?
4. What is the primary risk of using 'Listwise Deletion' (removing any row that contains at least one null value) on a dataset where nulls are not missing at random?
5. You are preparing a dataset for a machine learning model. The 'Discount Code' column is missing 92% of its values. Based on best practices for data cleaning, what is the most appropriate action?

Answers and explanations come after you submit.