This is a very good introduction. It's about the right length (c8%); gives a little relevant background and context, indicating that the writer has thought about what a stereotype is in its broadest interpretation; makes some initial references to sources; and finally focuses precisely on the question, showing the reader that it has been fully understood and that it will be answered. Note that the wording of the final part of the introduction is very close to that of the question. If the essay follows in the same vein, it should get an excellent mark.
If the appendix is "formal," it should contain a beginning, middle, and ending. For example, if the appendix contains tables of test data, the appendix should not only contain the tabular data, but also formally introduce those tables, discuss why they have been included, and explain the unusual aspects that might confuse the reader. Because of time constraints, your instructor might allow you to include "informal" appendices with calculations and supplemental information. For such "informal" situations, having a clear beginning, middle, and ending is not necessary. However, you should still title the appendix, place a heading on each table, place a caption beneath each figure, and insert comments necessary for reader understanding. (See a sample appendix .)