On the 40th anniversary of President John F. Kennedy's assassination, a FOX news poll showed 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 about this conclusion. Do you think that we know all of the relevant facts associated with Kennedy's assassination, or do you think that some information has been withheld? The following table contains the results of a nationwide poll of 900 registered voters.
|
We Know all Relevant |
Some Relevant Facts Withheld |
Not Sure |
| Democrat |
42 |
309 |
31 |
| Republican |
64 |
246 |
46 |
| Other |
20 |
115 |
27 |
a Do the data provide sufficient evidence to indicate a dependence between party affiliation and opinion about a possible cover-up? Test using α = .05.
b Give bounds for the associated p-value and interpret the result.
c Applet Exercise Use the χ2 applet to obtain the approximate p-value.
d Why is the value you obtained in part (c) "approximate"?