Do you perform data wrangling and data cleaning before applying machine learning algorithms to your data analysis?

This is an operational question. The interviewer will ask operational questions to learn more about how you go about doing your job. One of the key responsibilities of a data scientist is to ensure that the data sets they are using are appropriate for the analysis they are performing. Data wrangling and cleaning are two processes used to accomplish this. You should be familiar with these and able to explain them. As with any operational question, keep your answer direct and to the point and anticipate a follow-up question or two.