The null hypothesis in a research study of the access to mental health services for first responders with PTSD would be that there is no statistically significant difference in the access to mental health services between first responders with PTSD and those without PTSD. In other words, the null hypothesis assumes that any observed differences in the access to mental health services between the two groups are due to chance or random variation rather than an actual difference between the groups. Identify the statistical analysis or analyses to be used to answer the null hypothesis.