Analysis:

Based on the given feature description, the feature PAQ605 represents whether the respondent engages in moderate or vigorous-intensity sports, fitness, or recreational activities in a typical week. The possible values for PAQ605 are 1 and 2. 

To analyze how this feature relates to the target variable (age group), we can hypothesize that seniors may be less likely to engage in moderate or vigorous-intensity physical activities compared to non-seniors. Therefore, we can expect to see a higher proportion of 2s (representing no engagement in activities) in the PAQ605 values for the senior age group.

Based on this analysis, let's create the dictionary:

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

In this example, we have included five possible values for PAQ605 for each target class. The "Adult" class has values of 1 (engaging in activities) and 2 (not engaging in activities), while the "Senior" class has values of 2 (not engaging in activities) and 1 (engaging in activities).

Please note that the actual values may vary depending on the dataset used for analysis. The provided values are for illustrative purposes only.