Question

1. we want to see which brand of heater is the best, both in how hot it gets and how long it takes to warm up. a. independent variable: b. dependent variable:

Explanation:

In an experiment, the independent variable is what is changed or controlled, and the dependent variable is what is measured. Here, we change the brand of the heater to measure its performance in terms of heat - output and warm - up time.

Answer:

a. Brand of heater
b. How hot the heater gets and how long it takes to warm up