A group of athletes created an experiment to see whether running in place for two minutes would increase their pulse. They choose a student to run in place for two minutes and then measured their pulse.
They analyzed the data, and they decided that because the pulse measurement was higher than their normal value, running in place does increase pulse.

What was wrong with Experiment 1?

1.They didn't include a control group

2.They didn't include multiple trials

3.They included more than one independent variable

4.They should've had more than one test subject