In 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the assassination of President Kennedy, and found that 634 believe there was a conspiracy ("Gallup news...

In 2013, the Gallup poll asked 1,039 American adults if they believe there was a

conspiracy in the assassination of President Kennedy, and found that 634 believe

there was a conspiracy ("Gallup news service," 2013). Estimate the proportion of

American’s who believe in this conspiracy using a 98% confidence interval.

For a 98% confidence interval, z =

I don't understand how to get the z score