Independent random samples from two regions in the same area gave the following chemical measurements (ppm). Assume the population distributions of the chemical are mound-shaped and symmetric for these two regions. Region 1: X1 , n1 = 12 1008 852 567 749 764 727 945 657 880 773 1023 1002 Region II: X2 , n2= 16 1070 750 879 836 711 1070 706 866 608 892 891 965 998 1089 852 443 Let /1 be the population mean for *1 and 2 be the population mean for X2 Find a 90% confidence interval for H1 - P2 O - 84.56 to 129.98 O - 87.63 to 133.05 O - 127.32 to 81.90 O - 129.98 to 84.56 O - 133.05 to 87.63