Once we have data in a normalized and aggregated form, business analysts can run pivot tables and what-if analysis, and data scientists can run statistical analysis to present insights to executive management empowering them to make business decisions. This process of democratizing the Data Lake is also termed Data access.

For our airline on-time performance project in this chapter, we will analyze the aggregated and cleansed data that was performed in the previous chapter. The following figure shows the flow of data from Ingest to Report:

In the next few sections, we will see how to use Excel and other tools to perform analysis.