Determine whether the data in the diagram is a function, and state the domain and range. 

In order to determine whether the data in the diagram is a function, we need to check if each input (x-value) in the domain has exactly one output (y-value) in the range.

However, since no diagram has been given, it is not possible to determine if the data is a function or state the domain and range. Please provide the diagram or details of the data in order to proceed with the analysis.