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 8.122

25. Confidence level 90%, , ,

8.2.25

(a) (b) We are not told that the population is normal. However, the sample size is large ( is ). (c) (34.4, 35.6). We are 90% confident that the population mean lies between 34.4 and 35.6.

(d)

image