9 data represent petal lengths n cm) for ndependent random samples of two Spec 5 of Iris. Pelal length (in cm) of Iris Virgil-lice: x1; "1 = 35 5.0 5.6 6.5 6.1 5.1 5.5 5.3 5.5 6.9 5.0 4.9 6.0 4.8 6.1 5.6 5.1 5.6 4.3 5.4 5.1 5.1 5.9 5.2 5.7 5.4 4.5 6.4 5.3 5.5 6.7 5.7 4.9 4.3 5.7 5.3 Pelal length (in cm) of Iris setosa: :12; r12 = 38 1.6 1.9 1.4 1.5 1.5 1.6 1.4 1.1 1.2 1.4 1.7 1.0 1.7 1.9 1.6 1.4 1.5 1.4 1.2 1.3 1.5 1.3 1.6 1.9 1.4 1.6 1.5 1.4 1.6 1.2 1.9 1.5 1.6 1.4 1.3 1.? 1.5 1.7 (a) Use a calculator with mean and standard deviation keys to calculate ;1. 51. ;2. and 52. [Round your answers be two decimal places.) x1 in: x2= 52 (b) Let #1 be Hie population mean for x1 and let #2 he the population mean for x2. Find a 99% confidence interval for #1 #2. (Round your answers be two decimal places .] lower limit upperlimit