What is meant by saying that machines “learn” or machine learning?

Which of the following illustrate situations that will/can benefit from better machine-based predictions? Select all that apply.

Running a SQL query changes the underlying data. 

What information would be helpful (and feasible) in predicting how well a sports team will do during the upcoming season?

Which of the following statements concerning primary keys are true? Select all that apply.

All else equal, a higher true positive rate is associated with what? Select all the apply. 

Which of the following statements accurately describes a relational database? Select all that apply. 

What type of visualization is primarily used for time series?

What of the following are true statements regarding select statements? Select all that apply.

Which of the following violates the proportional ink rule? Select all that apply.