### Chapter 7, Survey Sampling

#### Solution 22

Since the confidence interval is , thus by comparing it with , it follows that .

Thus we can compute as:

Thus the size of confidence interval is .

$$\tag*{$\blacksquare$} $$

Since the confidence interval is , thus by comparing it with , it follows that .

Thus we can compute as:

Thus the size of confidence interval is .

$$\tag*{$\blacksquare$} $$