Based on prior knowledge, the relationship between the SkinThickness feature and the task of determining if a person has diabetes can be analyzed as follows:

SkinThickness is a numeric variable that represents the thickness of the triceps skin fold (in mm). Typically, a higher skin thickness indicates a higher amount of subcutaneous fat, which can be associated with obesity and insulin resistance, both of which are risk factors for diabetes.

For the 'yes' class (people with diabetes), typical values of SkinThickness could include: 30.1, 32.5, 35.2, 38.4, 40.8 (these values are just examples and may not reflect actual data).

For the 'no' class (people without diabetes), typical values of SkinThickness could include: 18.7, 22.3, 26.9, 29.5, 31.2 (again, these are just examples).

Based on this analysis, the dictionary can be written as:

```json
{
  "yes": [30.1, 32.5, 35.2, 38.4, 40.8],
  "no": [18.7, 22.3, 26.9, 29.5, 31.2]
}
```