What are some of the positive and negative outcomes if data analysis is not conducted properly during the Plan Project Management process?

Explain the process of using data analysis during the Plan Project Management process (note that data gathering and data analysis are two of the tools and techniques that the PMBOK® Guide identifies for Plan Procurement Management. See Part 1, Section 12.1.2 to find out more).

What are some of the positive and negative outcomes if data analysis is not conducted properly during the Plan Project Management process?