8. Daily wage is $ 13.62 for transportation workers and $ 1 1.61 for factory workers. Assume that these two estimates are based on random samples of 1000 and 1200 workers taken, respectively, from the two populations. Also assume that the standard deviations of the two populations are $1.85 and $1.4, respectively. Test at the 5% signicance level if the mean daily wage of transportation workers and factory workers are the same against the alternative that it is higher for transportation workers. 9. The following information was obtained from two independent samples selected from two populations: nx=20 E 233-75 5x = 5.25 ny=23 3 =28.50 sy =4.55 Test at 1% significance level if the two population means are different