Exercise

# Exercise 12 - Standard Error of the Difference Between Polls

Using what we learned by answering the questions above, what is the standard error of \(\bar{Y}_{2} - \bar{Y}_1\)?

Instructions

### Possible answers

\(\sqrt{\sigma_2^2/N_2 + \sigma_1^2/N_1}\)

\(\sqrt{\sigma_2/N_2 + \sigma_1/N_1}\)

\((\sigma_2^2/N_2 + \sigma_1^2/N_1)^2\)

\(\sigma_2^2/N_2 + \sigma_1^2/N_1\)