Refer to Exercise 10.53. Testing of 60 additional randomly selected containers of the drug gave a sample

Question:

Refer to Exercise 10.53. Testing of 60 additional randomly selected containers of the drug gave a sample mean and variance equal to 5.04 and .0063 (for the total of n = 64 containers). Using a 95% confidence interval, estimate the variance of the manufacturer's potency measurements.
Exercise 10.53