For Exercises 1 and 2, answer the following questions:

  1. Calculate .
  2. Find for a confidence interval for with 95% confidence.
  3. Compute and interpret , the margin of error for a confidence interval with 95% confidence.
  4. Construct and interpret a 95% confidence interval for .

Question 8.302

1. A sample of with sample mean is drawn from a normal population in which .

8.99.1

(a) 5 (b) (c) . We can estimate the population mean to within 9.8 with 95% confidence.

(d) (90.2, 109.8). We are 95% confident that the population mean lies between 90.2 and 109.8.