Question 8.142

45. Hospital Length of Stay. Refer to Exercise 41.

  1. Calculate and interpret the margin of error.
  2. If the sample size is increased to 400, describe what will happen to the margin of error.

8.2.45

(a) days. We can estimate the population mean length of stay in hospital of all heart attack victims to within 1.1 days with 95% confidence. (b) It decreases.