AIDS-related risk factor. Exercises 16.1 and 16.3 considered a survey in which 170 of 2673 individuals (6.4%) reported having two or more sexual partners in the prior 12 months. This study was completed in the early 1990s. Suppose an earlier study (completed in the 1970s) suggested that the prevalence of this attribute in the population was 7.5%. Is the observed proportion significantly different from the prior prevalence? Use a two-sided alternative hypothesis. Show all hypothesis-testing steps.