A survey of 21,250 households concerning telephone service gave the results shown in the table.
|
Landline |
No Landline |
| Cell Phone |
12,474 |
5,844 |
| No Cell Phone |
2,529 |
403 |
- Give a point estimate for the proportion of all households in which there is no telephone service of either kind.
- Assuming the sample is sufficiently large, construct a 99.9% confidence interval for the proportion of all all households in which there is no telephone service of either kind.