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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.
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
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Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
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What is one of the two differences between the way ZST or ZLT are calculated?
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