Based on prior knowledge, we can analyze the relationship between the feature "existing_credits" and the target variable "Does this person receive a credit?". The feature "existing_credits" represents the number of existing credits at a bank.

Analyzing the relationship:

1. Possibility 1: Yes
   - If the person has a higher number of existing credits at this bank, they may have a higher likelihood of receiving credit.
   - Typical values could be: 1.0, 2.0, 3.0, 4.0, 5.0

2. Possibility 2: No
   - If the person has a lower number of existing credits at this bank, they may have a lower likelihood of receiving credit.
   - Typical values could be: 0.0, 1.0, 2.0, 3.0, 4.0

Based on this analysis, we can create a dictionary with the provided format:

```json
{
    "yes": [1.0, 2.0, 3.0, 4.0, 5.0],
    "no": [0.0, 1.0, 2.0, 3.0, 4.0]
}
```