Question: Express the confidence interval 18.6% \u00b1 5.8% in the form of a trilnear inequality.
1. **State the problem:** We need to express the confidence interval given as $18.6\% \pm 5.8\%$ in the form of a trilnear inequality.
2. **Understand the confidence interval:** The confidence interval means the parameter $p$ lies within $5.8\%$ above or below $18.6\%$.
3. **Write the inequality:** This can be expressed as:
$$18.6\% - 5.8\% < p < 18.6\% + 5.8\%$$
4. **Calculate the bounds:**
$$18.6 - 5.8 = 12.8$$
$$18.6 + 5.8 = 24.4$$
5. **Final inequality:**
$$12.8\% < p < 24.4\%$$
This is the trilnear inequality form of the confidence interval.