Hepatitis C is a blood-born viral infection that causes liver inflammation and infection that, over time, can lead to liver disease. There is no vaccine against this strain of hepatitis, so preventive measures are the only management techniques. One of the ways hepatitis can be transmitted is by use of improperly sterilized tattoo equipment or contaminated dyes, which in turn has led to more stringent sterilization requirements for commercial tattoo parlors. Researchers at the University of Texas Southwestern Medical Center examined the medical records of 113 patients who had a tattoo to see whether these sterilization requirements at commercial parlors are reducing the proportion of hepatitis C among those with tattoos, compared to those who get tattoos elsewhere. Data are summarized in the following table.

	Commercial parlor	Elsewhere	Total
Has Hep-C	10	15	25
Does not have Hep-C	60	28	88
Total	70	43	113

Use the Theory-Based Inference applet to find a 95% confidence interval for the difference in probability of developing hepatitis C between the two types of parlors (commercial - elsewhere).