For Exercises 23–28, we are taking a random sample from a population with unknown. However, do not assume that the population is normally distributed.

  1. Find .
  2. Confirm that the requirements are met for the confidence interval for .
  3. Construct the confidence interval for with the indicated confidence level.
  4. Sketch the confidence interval on a number line.

Question 8.124

27. Confidence level 95%, , ,

8.2.27

(a) (b) We are not told that the population is normal. However, the sample size is large ( is ). (c) (−21, −19). We are 95% confident that the population mean lies between −21 and −19.

(d)

image