Analysis:

To analyze the relationship between the feature LBXGLT and the age group target variable, we need to determine the appropriate ranges of values for each age group. Since the feature description does not provide any specific information about LBXGLT, we will use our prior knowledge to determine these ranges.

LBXGLT is not a commonly known feature, and without any additional context, it is difficult to determine the appropriate ranges for each age group. In this case, we could assume that LBXGLT represents some kind of glucose level in the respondent's body. Generally, glucose levels tend to increase with age, so it is reasonable to assume that higher LBXGLT values might be associated with the senior age group.

Based on this assumption, we can create a dictionary with LBXGLT values for each age group.

Dictionary:

```json
{
	"Adult": [71.2, 81.5, 67.9, 76.1, 74.3],
	"Senior": [89.7, 94.5, 82.2, 85.6, 91.8]
}
```

Please note that the LBXGLT values provided here are just examples and should not be considered as actual data. The specific values would depend on the dataset and the underlying relationship between LBXGLT and age group in the data.