From my prior knowledge, education level is likely to be strongly correlated with income. Generally, individuals with higher levels of education tend to earn more than those with lower levels of education. 

Based on this analysis, I will create a dictionary that shows the possible values of the 'education' feature for each target class. The dictionary will only include values that have a clear relationship with the target variable. 

```json
{
    "no": ["11th", "HS-grad", "10th", "7th-8th", "Some-college", "9th", "12th", "1st-4th", "Preschool"], 
    "yes": ["Assoc-acdm", "Prof-school", "Bachelors", "Masters", "Doctorate", "Assoc-voc", "5th-6th"]
}
```