Based on the output from the correct code for Question $1,$ which of the following best represents the $95\%$ confidence interval for the difference in CAPS$-5$ scores between people with PTSD who took a ketamine treatment vs$.$ those who took a midazolam treatment?

Note: The values you got might be slightly different $-$ each time you run the code they will be slightly different. Run the code a few times and choose the answer that is closest.

$-14\mathrm{.}6-8\mathrm{.}4$

$-2\mathrm{.}2$