Harry has three dogs, they are the same size and breed. He wants to see if their weight increases over three weeks by giving them dry food but on week two he gives one of the dogs some wet food. Is this a fair test?

The one thing you can change, limiting to only one in an experiment

Lucy gives her plant the same amount of water everyday and checks the plant's height. What is the dependent variable?

What produces valid data?

Everything that stays the same

The dependent variable depends on the ___________?

The change that happens because of the independent variable

What is the variable called that is measured?

What is the variable called that is changed by the scientist?

Scientists call anything that can change and have different values in an experiment a _________