Independent random samples of size 40 are drawn from two quantitative populations, producing the sample information in the table. Sample 1 Sample 2 Sample Size 40 40 Sample Mean 13 9 Sample Standard Deviation 7 9 Find a 95% upper confidence bound for the difference in the two population means (Jul p2). (Round your answer to two decimal places.) x You may need to use the appropriate appendix table or technology to answer this question. : n Observations are to be selected from each of two populations 1 and 2 It you wish to estimate the difference between the two population means correct to within 0.11, 2~ 1 ma Independent random samples of H1 : n2 with probability equal to 0.90, how large should "1 and n2 be? Assume that you know a 2 x 23.5. (Round your answer up to the nearest whole number.) 2 IE use :71 : r72 : 0 998 x observations You may need to use the appropriate appendix table to answer this question. LT