5-18. An article in IEEE International Symposium on Electromagnetic Compatibility (Vol. 2, 2002, pp. 667-670) describes the quantification of the absorption of electromagnetic energy and the resulting thermal effect from cellular phones. The experimental results were obtained from in vivo experiments conducted on rats. The arterial blood pressure values ( mmHg ) for the control group (8 rats) during the experiment are x1=90,s1=5 and for the test group ( 9 rats) are x2=115,s2=10. (a) Is there evidence to support the claim that the test group has higher mean blood pressure? Assume that both populations are normally distributed but the variances are not equal. Answer this question by finding the P-value for this test. (b) Calculate a confidence interval to answer the question in part (a)