An article in IEEE International Symposium on Electromagnetic Compatibility (2002, Vol. 2, pp. 667–670) quantified the absorption of electromagnetic energy and the resulting thermal effect from cellular phones. The experi- mental results were obtained from in vivo experiments con- ducted on rats. The arterial blood pressure values (mmHg) for the control group (8 rats) during the experiment are 5 and for the test group (9 rats) are x2 = 115, I = 90, s1 = S2 = 10. Find a 95% confidence interval on the difference in mean blood pressure µi - µ2. Assume each population is normally distributed but that their variances are not equal.