Answer?

uuesuon b u mark this quesrion Scientists want to test a new pair of running shoes. A speed test is performed with two separate groups of participants. The treatment group will wear the new pair of running shoes, while the control group will not. it is believed that age and height may affect speed. Which of the following would be most effective in controlling the confounding variables, such as age and height, in this study? 0 A longitudinal observational study 0 A retrospective observational study 0 A matched-pair design experiment 0 A completely randomized design experiment