Final answer:
The data on championship heavyweight fights and murder rates do not provide convincing evidence of a linear relationship between population size and homicide rate.
Step-by-step explanation:
The data on championship heavyweight fights and murder rates do not provide convincing evidence of a linear relationship between population size and homicide rate. To determine if there is a linear relationship, a statistical test can be carried out at a significance level of 0.05. However, it is important to note that the question does not provide the specific data on championship heavyweight fights and murder rates, so a specific analysis cannot be conducted.