Exercise

# Confidence interval by hand

There are two common ways that interviewers will touch on confidence intervals; they will either ask you to explain it in simple terms, or elaborate on how they are calculated, possibly having you implement one. In this exercise, you'll practice the latter by **producing a confidence interval** by hand, using no packages other than those imported for you.

We have gone ahead and assigned the appropriate z-score for a 95% confidence interval and sample mean to the `z_score`

and `sample_mean`

variables to simplify things a bit.

Instructions

**100 XP**

- Compute the standard error and the margin of error using the
`sem()`

function and`z_score`

variable imported for you. - Compute and print the lower boundary of our confidence interval using the
`sample_mean`

variable imported for you. - Compute and print the upper boundary of our confidence interval using the
`sample_mean`

variable imported for you.