14.24 The JFK Assassination On the fortieth anniversary of JFK's assassination, a FOX News poll showed 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 Ameri- cans 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 countrywide:

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

b. If there is a significant difference in part

a, describe the nature of these differences.

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We Know All the Facts There Was a Cover-Up (Not Sure) Democrats 42 309 31 Republicans 64 246 46 Independents 20 115 27