Based on the given feature description and task, we want to analyze the relationship between the feature PAQ605 and the target variable, which is the person's age group (Senior or non-senior).

Since the feature PAQ605 represents whether the respondent engages in moderate or vigorous-intensity physical activity in a typical week, we can use our prior knowledge to determine the appropriate ranges of values. Typically, a value of 1 represents that the respondent takes part in weekly moderate or vigorous-intensity physical activity, while a value of 2 represents that they do not.

To analyze the relationship between PAQ605 and the target variable, we can look at the typical values of PAQ605 for each age group.

Possible values of PAQ605 for the target class 'Adult':
1. 1.0
2. 1.0
3. 1.0
4. 2.0
5. 2.0

Possible values of PAQ605 for the target class 'Senior':
1. 1.0
2. 2.0
3. 2.0
4. 2.0
5. 1.0

Based on this analysis, we can create the dictionary as follows:

```json
{
	"Adult": [1.0, 1.0, 1.0, 2.0, 2.0],
	"Senior": [1.0, 2.0, 2.0, 2.0, 1.0]
}
```

This dictionary represents the possible values of PAQ605 for each target class, with 'Adult' and 'Senior' as the keys and the respective values as the lists of floats.