Question

Almost 50 years after the assassination of John F. Kennedy, a poll shows that most Americans disagree with the government's conclusions about the killing. The Warren Commission found that Lee Harvey Oswald acted alone when he shot Kennedy, but many Americans are not so sure. Do you think that we know all the facts about the assassination of President John F. Kennedy or do you think there was a cover-up? Here are the results from a poll of 900 registered voters nationwide.

	We Know All the Facts	There Was a Cover-Up	Not Sure
Democrats	42	309	32
Republicans	64	247	47
Independents	20	115	24

(a) Do these data provide sufficient evidence to conclude that there is a difference in voters' opinions about a possible cover-up depending on the political affiliation of the voter? Test using α = 0.05.

Find the test statistic. (Round your answer to three decimal places.)

Χ² =

Answer 1