A student wants to know if girls are better at balancing than boys. She gathers 25 of her 12 year old female friends and 25 boys who are also 12 years old. Her hypothesis is that girls will have better balance. She sets up a balance beam 1 foot off the ground and has each student walk across 2 times. She counts how many times they slip off the beam and records her data in a chart. At the end of her experiment, she has noticed that the girls fell off the beam a total of 10 times and the boys fell off 15 times all together. Did she use a “control group”?