In 2001, the Gallup poll found that 81% of American adults believed that there was a...
In 2001, the Gallup poll found that 81% of American adults believed that there was a conspiracy in the death of President Kennedy. In 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the assassination, and found that 634 believe there was a conspiracy ("Gallup news service," 2013). Do the data show that the proportion of Americans who believe in this conspiracy has decreased? Test at the 5% significance level.
1- What is the alternative hypothesis?
2- What is the value of the test statistic?
3- What is the p-value?
4- What is your decision based on the p-value you obtained?
5- What is a 95% confidence interval for the proportion of Americans who believe in this conspiracy has decreased?
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In 2001, the Gallup poll found that 81% of American adults
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