A researcher is testing a new behavioral therapy that helps people with phobias of spiders. She wants to know if this therapy significantly reduces anxiety associated with spiders. The population of individuals with spider phobias have an average anxiety rating of 88 when encountering spiders (SD=7). The researcher measures the spider anxiety rating of a group of 75 patients after they have undergone 6 weeks of the behavioral therapy. Her sample mean is 86.

What is the mean of your comparison population?