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 [.12). (Round your answer to two decimal places.) : You may need to use the appropriate appendix table or technology to answer this question. Independent random samples of n, = n, = n observations are to be selected from each of two populations 1 and 2. If you wish to estimate the difference between the two population means correct to within 0.1 with probability equal to 0.90, how large should n, and /2 be? Assume that you know of2 2 02 ~ 23.5. (Round your answer up to the nearest whole number.) LA USE SALT n1 = n2 = observations You may need to use the appropriate appendix table to answer this