9. Company officials were concerned about the length of time a particular drug product retained its potency. A random sample, sample 1, of n1 = 10 bottles of the product was drawn from the production line and analyzed for potency; sample 2, of n2 = 10 bottles was obtained and stored in a regulated environment for a period of one year. The readings obtained from each sample are given below. 1. Samplel Sample2 2. 10.2 10.6 9.8 9.7 3. 10.5 10.7 9.6 9.5 4. 10.3 10.2 10.1 9.6 5. 10.8 10.0 10.2 9.8 6. 9.8 10.6 10.1 9.9 Suppose we let ul denote the mean potency for all bottles that might be sampled from the production line and u2 denote the mean potency for all bottles that maybe retained for a period of one year. Estimate ul - u2 by using a 95% confidence interval