Explain, using the Meredith Kercher – US vs UK media reports below as an example, the ways in which the media demonstrates a bias?
One of the major influences on what the media reports and how it reports it is the tastes of its customers. In other words, the media gives the consumers what they want to hear or read.
In the case of Meredith Kercher, the media of the UK and the US, respectively, take the sides of their own nationals because that is what their publics want to hear.
Looking at the first and the last of the links posted above, you can see this dynamic at work. In The Mirror, only the Kerchers' side of the story is presented, in CNN, only Knox's side is presented. The Mirror's story has many facts that tend to imply Knox's guilt while the CNN story presents facts and interpretations that tend to exonerate her. Bias is thus shown by what facts are shown in the articles and what opinions are presented.
This is a good start. For each, establishing the place of origin would be another excellent point. For example, the Daily Mirror being British and CNN being American. Examine the language used in each. How does this reflect bias of the news organization? Might there be another agenda being advocated? Another approach might be to see the similarities featured in each. What are some shared or common themes, ideas, or language that each share? How does each treat Amanda Knox and her role? In each, are there some shared presuppositions? What elements are present that might be able to feed the public's desire to know more in terms of sensationalism? These are questions to pose in examining the bias of each. In terms of the wikipedia site, the bias as well as its reliability might be something to examine, as well. Cross check it with examining some of the links on the bottom of the article.