How is regression analysis used to estimate a cost function?

The Cost Function

Q1: What are the different ways to describe cost behavior?

Q2: What process is used to estimate future costs?

Q3: How are engineered estimates, account analysis, and two-point methods used to estimate cost functions?

Q4: How does a scatter plot assist with categorizing a cost?

Q5: How is regression analysis used to estimate a cost function?

Q6: How are cost estimates used in decision making?