Is this for a school project or a technical manual ?
In cycling, "stalk" can refer to a quill stem or handlebar attachment. "2x7" often refers to a drivetrain configuration (2 chainrings in the front and 7 gears in the back) commonly found on vintage or entry-level road bikes. Stalk 2x7
It might relate to specific settings or models for stalking scopes (e.g., a 2-7x magnification range), which are used for tracking wildlife at variable distances. Is this for a school project or a technical manual
To provide you with the most accurate write-up, could you please clarify what you mean by ? a 2-7x magnification range)
design typically tests two independent variables, one with 2 levels and one with 7 levels.