BusinessInsider - Researchers asked 1,185 random nationwide
respondents what news sources they had consumed in the past
week and then asked them questions about events in the U.S.
and abroad.
National News
On average, people correctly answered 1.6 of 5 questions
about domestic affairs.
Because the aim of the study was to isolate the effects
of each type of news source, they then controlled for variables
such as other news sources, partisanship, education and other
demographic factors.
They found that someone who watched only Fox News would be
expected to answer 1.04 domestic questions correctly compared
to 1.22 for those who watched no news at all.
Those watching only "The Daily Show with Jon Stewart"
answered 1.42 questions correctly and people who only listened
to NPR or only watched Sunday morning political talk shows
answered 1.51 questions correctly.
SEE GRAPH:
http://static2.businessinsider.com/image/4fbbf449eab8ea4c79000007/news.jpg
International News
With all else being equal, people who watched no news were
expected to answer 1.28 correctly; those watching only Sunday
morning shows figured at 1.52.
Those watching only "The Daily Show" figured at 1.60; and
those just listening to NPR were expected to correctly answer
1.97 international questions.
Viewers of only Fox News figured at only 1.08.
SEE 2nd GRAPH:
http://static3.businessinsider.com/image/4fbbf993eab8ea870700001e/news.jpg
Thus, those who watched no news�answering questions by guessing
or relying on existing knowledge�fared much better than those who
watched the most popular 24-hour cable news network (i.e. Fox News).
More here:
http://www.businessinsider.com/study-watching-fox-news-makes-you-less-informed-than-watching-no-news-at-all-2012-5