State whether each of the following factors is an example of an independent variable or a…

State whether each of the subjoined factors is an issue of an refractory shifting or a quasi-refractory shifting. Only say “quasirefractory shifting” for participant shiftings that cannot be manipulated.

1. The age of participants

2. Span allotted for preliminary an exam

3. A teacher’s earlier training trial

4. Span of day a consider is conducted

5. A participant’s say of residence

 6. Amount of span gone-by considering