这道题怎么做---**Overall Problem Description:**
To study the relationship between a certain disease and ultrasound examination results, 1000 people who had undergone ultrasound examinations were randomly surveyed, and the following contingency table was obtained:
**Table Content:**
| | 正常 (Normal) | 不正常 (Abnormal) | 合计 (Total) |
|---|---|---|---|
| 患该疾病 (Has the disease) | 20 | 180 | 200 |
| 未患该疾病 (Does not have the disease) | 780 | 20 | 800 |
| 合计 (Total) | 800 | 200 | 1000 |
**Question (1):**
记超声波检查结果不正常者患有该疾病的概率为 p，求 p 的估计值；
(Let p be the probability that a person with an abnormal ultrasound examination result has the disease, find the estimated value of p;)
**Question (2):**
根据小概率值 α = 0.001 的独立性检验，分析超声波检查结果是否与患该疾病有关。
(Based on the independence test with a significance level α = 0.001, analyze whether the ultrasound examination result is related to having the disease.)
**Supplementary Information (附):**
**Formula:**
χ² = n(ad-bc)² / ((a+b)(c+d)(a+c)(b+d))
**Table (Chi-squared critical values):**
| P(χ² ≥ k) | 0.050 | 0.010 | 0.001 |
|---|---|---|---|
| k | 3.841 | 6.635 | 10.828 |