A recent survey quizzed journalism students about the sorts of stories they themselves wished to read.
Conclusion (this indicates that)
Today's trends in publishing are based on false assumptions about the interests of the public.
rephrase: the public is not that interested in stories covering lifestyle trends and celebrity gossip
Evidence
In a survey of journalism students, a significant majority said they wanted to see stories dealing with serious governmental and political issues and had little tolerance for the present popularity of stories covering lifestyle trends and celebrity gossip.
Evaluate
The author's conclusion is saying that the public isn't really interested in stories covering lifestyle trends and celebrity gossip (those types of stories are presently popular, but the author thinks that this is based on false assumptions about what the public wants).
How does the author know what the public is really interested in?
She cites a survey of journalism students. Are the interests of journalism students a good reflection of what the interests of the public are?
Probably not. First of all, journalism students are just a specific subcategory of people, so they're not a good proxy for the general public regardless of the issue.
But in particular with this issue, it seems like journalism students are way more likely than an average person to want to see stories dealing with serious governmental and political issues.
The whole reason these students are majoring in journalism is because they want to write stories dealing with serious governmental and political issues (people don't major in journalism to write articles about lifestyle trends or celebrity gossip).
Goal
So it seems like we're dealing with the Famous Flaw, Sampling. This argument relies on a sample group that likely has a biased, self-selecting interest in serious news stories over easy-to-read crap about trends and celebrities.