The chart shows the correlation of the BMI and the heart rate differences before and after exercise. The BMI is presented on the y axis and the heart rate difference on the x axis. It can be observed that much of the differences of heart beat per minute is clustered around the BMI of 15-20-25 and become less. The heart rate difference is hence higher within certain BMI ranges and becomes less when the BMI goes above 25, with few scatters observed in the 30 and above range. Also 20-25 BMI ranges have more difference in heart rate, compared to even the 25-30 and above BMI ranges. This shows that BMI might not have such a significant effect on the heart rate difference before and after exercise. Therefore, hypothesis that the increase in BMI results in increase in the difference in heart rate before and after exercise need not be true. There are good chances that the results might be skewed as well; this is because some participants had not filled in data. Additionally, most of them fell into only certain BMI ranges and hence it was difficult to understand data across different ranges.