Why should a conclusion to a speech reinforce the central idea of the speech?

Discussion Questions:Question 1 (Chapter 3)Which of the four causes of poor listening do you consider the most negative? Why? Give examples that support your reasoning.
Choose a specific case of poor listening in which you were involved. Explain what went wrong. Then, explain what you would do differently to turn this into a positive experience.Question 2 (Chapter 4)Why should an introduction to a speech gain the attention of the audience?
Why should an introduction to a speech offer the central idea and preview the main points to be discussed?
Why should a conclusion to a speech reinforce the central idea of the speech?
For an occasion outside the classroom where you might give a speech of self-introduction, explain how you would apply the principles of introductory speeches discussed in Chapter 4.