Exercise

# Exercise 9. Standard error of the spread

Say the actual proportion of Democratic voters is \(p=0.45\). In this case, the Republican party is winning by a relatively large margin of \(d= -0.1\), or a 10% margin of victory. What is the standard error of the spread \(2\bar{X}-1\) in this case?

Instructions

**100 XP**

- Use the
`sqrt`

function to calculate the standard error of the spread \(2\bar{X}-1\).