1. Calculate the z-score for x = 58 is x bar is 70 and s^2 is 5.
2. The z score for x-bar = 2.7, u = 3, s = 1, and n = 100
3. Find a 95% confidence interval for u if s = 5.26, x-bar =70.1, and n = 49
4. Compute a 99% confidence interval for u if x-bar = 16.3, s = 1.5, and n = 25