Based on the given feature description, RIAGENDR represents the respondent's gender, with 1 representing Male and 2 representing Female. To analyze its relationship with the target variable, we need to determine if there is any significant difference in the distribution of RIAGENDR values between the 'Adult' and 'Senior' age groups.

To construct the dictionary, we will examine the possible values of RIAGENDR for each age group and include 5 typical values for each target class.

Based on prior knowledge, let's assume the following age ranges:
- Adult: 18-64 years old
- Senior: 65+ years old

Here is the dictionary with the requested format:

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

Please note that the values in the lists are floats to maintain consistency with the given feature representation.