Which of the following statements is not true?

answer selection group

Using the total revenue test, we know that the demand is inelastic if the total revenue decreases when the price rises.

If you are willing to spend 1,000 dollars to submit your application documents, but if you can pay 100 dollars for a delivery service, your consumer surplus is 900 dollars.

Regression analysis is a statistical technique for modeling and analyzing several variables.

You can draw a demand curve with the assumption of Ceteris Paribus.