Instructions

No in depth information is needed, just identify what you are being asked to identify.

For the following question, you can put short answers, there is no need to provide explanations unless otherwise asked.

An experimenter wanted to compare muscle growth after a leg-based weightlifting routine and a arms-based weightlifting routine. He randomly assigned individuals into 2 groups: leg-based weightlifting group or an arms-based weightlifting group three times a week for 3 weeks. After three weeks, he found that individuals that participated in a leg-based weightlifting routine had overall more muscle mass than those that participated in the arms-based weightlifting routine.

1. What kind of data structure is this? (.5):
2. Can the researcher infer causality? (.5):
3. What are the variables, if any? State variable and what kind it is? (1):
4. What is the most likely scale of measurement for each variable? (1):