Research articles about different ways to heat popcorn to make it pop. Design an experiment that tests multiple types of popcorn using repeated trials. Heat kernels of some types on an electric stove and heat other types on a gas stove. Construct a mathematical equation that compares size and mass of kernels from each type.
I gave my students this multiple choice question: Which method should be used to determine the type of popcorn that produces the greatest number of popped kernels?

Only one answer is correct among these 4 choices:
- Research articles about different ways to heat popcorn to make it pop.
- Design an experiment that tests multiple types of popcorn using repeated trials.
- Heat kernels of some types on an electric stove and heat other types on a gas stove.
- Construct a mathematical equation that compares size and mass of kernels from each type.

Could you tell me which one is correct?

Design an experiment that tests multiple types of popcorn using repeated trials.