Need help with this. It has to do accounting research, please.

Access the FASB Codification at http://asc.fasb.orgAtome to prepare responses to the following exercises. Provide Codification references for your responses. CE22-1 Access the glossary ("Master Glossary") to answer the following. What is a change in accounting estimate? What is a change in accounting principle? What is a restatement? What is the definition of "retrospective application"? CE22-2 When a company has to restate its financial statements to correct an error, what information must the company disclose? CE22-3 What reporting requirements does retrospective application require? CE22-4 If a company registered with the SEC justifies a change in accounting method as preferable under the circumstances, and the circumstances change; can that company switch back to its prior method of accounting before the change? Why or why not