In order to compare the average heights of children in 5th grade in two different states in US., one takes a random sample of 45 students in state A and a random sample of 65 students in state B. If the two sample means are 62 inches and 55 inches and the two sample standard deviations are 12 and 10, then what would be the standard error of the difference of two sample means? A. 1.24 B. 1.79 C. 1.57 D. 2.18 2.What would be the degree of freedom of the corresponding t distribution? A. 18.5 B. 41.1 C. 83.2 D. 108 3.What would be the t-critical value for the 95% confidence interval? A. 1.99 B. 2.02 C. 2.1 D. None of these

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