Based on my prior knowledge, I can analyze the relationship between the feature 'duration' and the target variable 'subscription to a term deposit' (Yes or No). Here is the analysis and the resulting dictionary:

- Duration values for target class 'no' (Did not subscribe to a term deposit):
    - Typically, customers who did not subscribe to a term deposit may have shorter call durations.
    - Possible typical duration values for target class 'no' could be: [0.5, 1.2, 1.8, 2.3, 3.1]

- Duration values for target class 'yes' (Subscribed to a term deposit):
    - Typically, customers who subscribed to a term deposit may have longer call durations.
    - Possible typical duration values for target class 'yes' could be: [3.5, 4.2, 5.6, 6.8, 7.9]

Based on this analysis, here is the resulting dictionary in the requested format:

```json
{
  "no": [0.5, 1.2, 1.8, 2.3, 3.1],
  "yes": [3.5, 4.2, 5.6, 6.8, 7.9]
}
```