Researchers recruited 150 participants (50 in each group) from a local gym and randomly assigned them to one of three exercise programs: aerobic, strength training, or flexibility. Each participant completed their respective exercise program for a duration of 12 weeks, attending three sessions per week. At the conclusion of the training period, each participant underwent measurements for VO2 max (cardiovascular capacity), pounds lifted (muscular strength), and flexibility (measured in inches of reach). The data collected from all groups exhibited a normal distribution. What is the null hypothesis in this example? There is significant difference in mean cardiovascular fitness, muscular strength, and flexibility across the three exercise groups. There is no significant difference in mean cardiovascular fitness, muscular strength, and flexibility across the three exercise groups. All three groups will have a significant increase in mean cardiovascular fitness, muscular strength, and flexibility