Use only six (X, Y) pairs (those corresponding to the first six lot numbers) in Table 8.1 and compute a new estimator
2 (8.38) for the asymptotic variance of
(see Comment 26). Compare it with the estimator based on all nine observations obtained in Example 8.3.
![](https://test.transtutors.com/qimg/448615b6-6507-4d23-b776-b6287beec619.png)
Example 8.3
Consider the canned tuna data of Table 8.1. We illustrate how to obtain an approximate 90% symmetric two-sided confidence interval for τ. From (8.37), we see that