Analysis:

To determine the appropriate ranges of values for the feature LBXGLU in relation to the task of predicting a person's age group (Senior or non-senior), we can consider the following:

1. High blood glucose levels are commonly associated with diabetes, which is more prevalent in older adults. Therefore, it can be expected that higher values of LBXGLU may be indicative of the Senior age group.
2. Normal blood glucose levels vary depending on the context, but a fasting blood glucose level below 100 mg/dL is generally considered normal for adults. Therefore, it can be assumed that lower values of LBXGLU may be more common in the non-senior (Adult) age group.

Based on the analysis above, we can create the dictionary:

```json
{
	"Adult": [90.5, 91.2, 93.8, 94.6, 98.3],
	"Senior": [105.7, 111.1, 115.9, 119.4, 121.8]
}
```

Please note that the LBXGLU values provided are arbitrary and only serve as examples. The actual values may vary based on the specific dataset and population being analyzed.