Suggest the following.
(a) Compute the estimate for the standard error of difference between two independent means for s12 = 10, s22 = 11, n1 = 30, and n2 = 18. (Give your answer correct to two decimal places.)
(b) Calculate the estimate for the standard error of difference between two independent means for s12 = 0.049, s22 = 0.09, n1 = 9, and n2 = 7. (Give your answer correct to four decimal places.)
(c) Calculate the estimate for the standard error of difference between two independent means for s1 = 2.8, s2 = 6, n1 = 29, and n2 = 26. (Give your answer correct to two decimal places.)