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If a 99% condence interval for the difference in the mean weights of the student populations in two large cities is between 2.?5 lbs and 3.?5 lbs, a zero difference in the two population means is_. O unlikely C} impossible C} certain C} likely Use the following sample information to construct a 90% confidence interval for the difference in the two population means. Sample 1 Sample 2 n1 = 33 n2= 32 X1 = 70.8 X2 = 69.1 01 = 6.23 02 = 8.2 (Round your answers to 2 decimal places, e-g. 1.75.) SH1 - H25